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The most significant update since version 5, TMCWv5.10, named after the fact it was released on the 10th anniversary of the first public release of TMCW, while not radically altering world generation / game mechanics (this is the criteria I've used to denote major version number changes), adds dozens of new blocks and items, a new biome, Cherry Grove, new world types, a new villager type, and many other features including ones from as of yet unreleased vanilla versions (as of its release).

This update had been released in two parts, the first of which was the final update to TMCWv5 and included dozens of bugfixes and improvements (as usual most of them are to fix vanilla issues, including many more issues that had been brought on by 1.3.1, one of the most notorious updates in the game's history due to making singleplayer run on an integrated server, with multiple issues due to poorly / not implemented networking code, e.g. the "damage tilt" used to follow the direction you took damage in). It also made improvements to maps, adding two more zoom levels, up to level 6 or 8192x8192 blocks, mainly for very large scale mapping without needing so much space (larger maps are also much cheaper to make than multiple smaller maps), but at the cost of detail:

New game rules have been added to facilitate customizing gameplay, including replacing separate class file patches that had previously been made to toggle things like the attack penalty or make mobs only spawn in complete darkness (due to popular request), as well as enable an older way of centering maps (based on the player's position when zooming, not just initializing for the first time, and aligned to a different grid, the latter being a more significant change):

attackPenalty, which defaults to true and enables the attack penalty feature.
doWeatherCycle, which defaults to true and disables the weather cycle when false.
noLightSpawning, which defaults to false and only allows hostile mobs in the Overworld to spawn in complete darkness when true.
oldMapCentering, which defaults to false and enables the old way of centering maps for compatibility with old worlds, or user preference.
randomTickSpeed, which defaults to 3 and ranges from 0 (disabled) to 300 (100 times faster).
sleepSpawning, which defaults to true and enables the mechanic from Beta where a mob spawns next to an unsafe bed.
limitMobDrops, which defaults to true and enables restrictions on mob drops (e.g. mobs spawned from spawners temporarily stop dropping loot if too many spawn too quickly and drops like iron from iron golems require a player kill).

The second part of the update, released as TMCWv5.10 proper, adds content which had been in development and/or planned to be added for much of the past year:

Many new blocks and block variants have been added, including many new variants of wood-based blocks for all wood types, such as doors and signs, as well as colored beds (existing beds will become white) and a new sign variant, hanging; fence gates also now have proper variants instead of just using the variant of wooden fence they were next to, and a new "iron fence gate", which is only activated with redstone, was added, as well as nether brick variants:

New mobs / mob variants have been added, including a new type of spider, "brown", which spawns in various biomes and deals twice as much damage (4 vs 2) and inflicts Weakness or Slowness (only one at a time); the color/texture is based on one from a very early developmental version which was never released. A new skeleton, variant, "bogged", which is being added in 1.21, now spawn in swamps and their attacks deal Poison for 4 seconds. Wolves now have wolf armor, another new vanilla item, except I based it off of horse armor, with all the same mechanics and being found in structure loot chests (as opposed to being crafted, having limited durability, and incredibly, negating all damage like shields (a very broken modern vanilla feature). A couple new biome-specific rabbit variants were also added; the pink variant is exclusive to Cherry Grove (all other colors have a small chance of appearing as a random mutation):

Other mobs have also recently had various AI improvements; spiders will now lose their grip so they drop down on the player when they walk under them (related to MC-151054, which sounds worse than it is in 1.6.4). and in a similar manner to spiders Endermen no longer become neutral immediately (or with a longer delay) when exposed to sunlight (this does have the advantage of them not just teleporting away if you see one during the day so it can be easier to hunt them, I know that collecting enough ender pearls can be a chore), and all mobs can now see and attack through transparent blocks (MC-3626; e.g. in vanilla you can safely wade though a cave spider corridor by just staying in the cobwebs); skeletons and creepers have a reduced attack radius when their sight is blocked by transparent blocks. Explosions similarly ignore / are attenuated less by such blocks (MC-145 and MC-59425; e.g. creeper explosion on lower slabs dealing little damage to nearby blocks and entities. Oddly enough, blocks not being damaged is considered to be a bug while entities not being damaged is "works as intended". I made them still reduce damage, roughly by half).

The Cherry Grove biome from 1.20 has been added in pretty much the same way, including all its new blocks, including the first-ever actual new wood variant (until now all trees used the four variants in vanilla 1.6.4, and still do; in a 1.7 snapshot acacia used jungle wood and dark oak used spruce wood, hence why I made them like that). There is also a new underground biome variation, with stone and granite reversed so the majority of the underground is granite, with stone appearing in pockets (ores are still stone; it is very difficult to see iron ore on a background of granite), and mineshafts using cherry wood:

The biome was added by replacing 1/128 of biomes in "normal" regions and adding it as a sub-biome of various other biomes (the second example above), including Plains and Meadow, both spawn biomes so there is a good chance you may spawn by one. Due to the way it was added the overall biome map did not change so existing worlds will generate normally, unless a Cherry Grove biome happened to be along the new-old chunk boundary (this is much like how Poplar Grove and a higher limit on terrain were added in version 3).

Another major new feature is several new world types; "Medium Biomes", with a biome size of 5, between Default (4) and Large biomes (6), offering a good compromise between the latter two (Default is probably too small for many people especially with there being so many biomes so two of the same biomes are much less likely to connect; many "individual" biomes in vanilla 1.6.4 are multiple smaller units joined together, where a single unit averages 256x256 blocks); "Oceanic" which greatly reduces the size of landmasses and makes "Survival Island" or "ocean exploration"-type worlds possible again (other world types always spawn you on a large continent with the nearest ocean being 500-1000 blocks away); and "Single Biome", which allows you to choose any of 129 biomes, even the Nether and End, which were modified to properly generate in the Overworld (vanilla adds Nether decorations as part of the the dimension itself):

A new villager type, "Woodworker", and village building, "Woodshop" were added, making use of the unused green villager skin ("nitwit" in modern versions) and enabling various wood-related items to be traded, and splitting off more tool trades from the overly-endowed blacksmith, which no longer sells axes, with woodworkers now selling them, as well as hammers (iron and diamond). Woodshops were based on butcher shops, with a tree in the fenced-in area. There is also a loot chest (a barrel behind the stairs in the corner) with relevant items, including saplings, which were moved from blacksmiths:

I also made a major change to trading mechanics - butchers and blacksmiths no longer accept charcoal, only coal, while woodworkers only accept charcoal, at a lower price (I really think it is easier to collect mass amounts of coal, even without Fortune. You'll also have to grind through a long list of trades to possibly unlock it as the final offer, aka a "perfect villager", so it is more of something to get pass in order to get the tool trades). Conversely, any type of wood (logs) can be given to a woodworker even though they are two separate block IDs (items sold by a woodworker, such as fences, may be of any wood type but they will only offer one type per block type).. Village generation was also tweaked so buildings can no longer touch each other (much like how mineshafts were previously fixed so they can't run right above/below themselves).

The product of years of development, TMCWv5 adds more new content than all previous versions combined, bringing the total number of features added by all versions to 325 blocks, 103 biomes, 45 entities/variants, 34 items, and 7 enchantments, in addition to dozens of new structures, trees, changes to game mechanics, and more (these include nonfunctional features present in vanilla such as giants, bark logs, and even 2x2 oak trees, and does not include variants of blocks that do not have an item form, such as plant variations in flower pots, only the addition of large flower pots). Note that due to the scale of the changes TMCWv5 cannot load worlds created in earlier versions; they will not even appear in the saves menu, only worlds it created (all other files are now completely separate from vanilla so the only issue with sharing game directories is loading a world created with TMCW in vanilla).

One of the biggest changes is a complete rewrite of world generation, which consequently generates completely different worlds from earlier versions and was a major reason for the delay in releasing TMCWv5; some of the core changes and new blocks were added in an intermediate update, TMCWv4.5. Cave generation in particular is much more varied with many new variations added, as well as increases to the size of the largest caves, which can exceed a million blocks in volume, 600000 for ravines and 1.7 million for a giant cave region (for comparison, in previous versions they could reach about 500000, 425000 and 1.3 million respectively), and large caves are significantly more common. Also, only the very largest caves are now excluded from generating near the origin; due to this the "NoExclusion" patch that previously disabled this exclusion has been dropped, partly also to ease maintenance:
Another significant change to world generation is that the area within about 1000 blocks of the origin is always entirely non-ocean biomes - it is highly unlikely that spawn will be in/next to an ocean or on a small island, and it will be within a relatively flat and open biome (plains, tropical swamp, meadow, mega tree plains, bushlands, or oasis) in the Default world type; Large Biomes may place biomes too far away to be detected, and also has different origin continent generation so oceans aren't so far away (due to this Large Biomes is not simply an upscaled version of Default until you get further from the origin). Land is also more common, making up about a third of the world, compared to about a fifth in vanilla (about 75% ocean, plus "rivers" along shorelines). Here is a large-scale land/ocean map:
Also, all world generation (caves, terrain, feature placement) now fully utilizes a 64 bit seed; previously, and in vanilla, only biome generation used all 64 bits with the result that any seed which differed by a multiple of 2^48 had the same non-biome dependent features, and even the biome generator itself had "shadow seeds" which reduced the number of unique biome maps to 2^63, but this was fixed. Text seeds also now use a 64 bit hash function instead of 32 bit (e.g. "TMCWv4" now hashes to "-4968953994433483799" instead of "-1816924181"), and the selection of a random seed enables any 64 bit seed to be chosen (it was previously based on Random, with 2^48 possible 64 bit values, some of which likely had the same lower 48 bits), and a random seed is now only used if the textbox is completely empty so you can directly enter 0 as a seed (there was no technical reason why this wasn't allowed):
There are also several new biomes added, as well as many minor biome variants to improve existing biomes (e.g. Ice Hills now has its own "river" variant which uses the same generation as its parent biome):
Here are some of the many mobs/mob/entity variants that were added, not including ones mentioned above, along with some notable changes to existing game mechanics:
Here are screenshots of all the new blocks and items, excluding "similar" variants (e.g. infested granite, which looks just like granite, or mushroom blocks other than caps):
Several new additions, Hammers, Smelting, Vein Miner, Luck Of the Sea/fishing non-fish items, and Dry Ice/ice generators, completely change or add fundamental new game mechanics, respectively allowing uncrafting, using Fortune on iron and gold and/or not needing a furnace to smelt them, mining multiple blocks at once (besides blocks like cactus which cause other blocks to lose support), and a new way to obtain various items:
Other notable features include barrels, a cheaper, lag-free alternative to chests (I did previously improve the performance of chests but they are still rendered as entities), and composters, which give dirt instead of bonemeal and can compost more blocks and items than the 1.14 version.

Maps have also been completely reworked, including dozens of new colors, the ability to map the Nether, End, and most significantly, caves:
Despite all of the content that has been added over the years TMCW remains incredibly lightweight; baseline memory usage is less than 30 MB (on a default Superflat world at 8 chunk render distance; the only thing a normal world changes is the amount of blocks loaded, depending on render distance every 16 block increase in depth (based on loaded sections, which is 1 for default Superflat) requires up to 21 MB of additional memory), and the size of the 1.6.4 jar plus TMCWv5 is smaller than vanilla 1.8 despite having far more content and a lot of redundant/dead code from unused vanilla classes:
A full list of all additions and changes can be found in the "Documentation" folder of the download.

A comparison of the same world rendered with Minutor and MCMap:

For comparison, this is how MCMap 2.4.3 renders the same world; it is possible to fix some of the colors with its colors.txt file but the majority of blocks in TMCWv5 are variants of existing blocks and what blocks have what variants is hardcoded into the program (for this reason I have not provided a colors.txt), and some blocks do not render at all:

Examples of the underground rendering mode, including an animation of what I explored over 10 days, showing how only explored caves (with torches) are rendered:

An example of the output window when underground mode is used; the original version prints out the location of every torch it finds (appears to be debug output that was left in), which I removed and replaced with the total number of torches found when finished. This and other changes help speed it up as well:

First, I added many new biomes to the normal 1.6.4 biomes, many of which were also tweaked, with a general increase in terrain variability by modifying the min/max height ranges so that normal biomes have a range similar to the normal X-Hills biomes (e.g. Forest -> Forest Hills) and those biomes in turn have a range closer to that of Extreme Hills (which were also modified a bit, though things get wacky with much more increase in height):

Big Oak Forest: Forest exclusively populated with big oak trees, including a 2x2 variant:

Birch Forest: Pretty similar to the biome with the same name in 1.7:

Bushlands: Plains-like biome with small bushes dotting the landscape (a modified form of the bushes in jungle biomes but with spruce leaves and variable size; the smallest bushes also have the log generated in the ground so they can have just one layer of leaves above ground):

Forest Mountains: A mountainous biome similar to Extreme Hills but heavily forested; oak, birch, and spruce trees generate in this biome:

Hilly Plains: Similar to plains but with hills and even mountains but usually more flat than mountainous; because this biome is based off the plains biome horses spawn here as well, though villages only spawn in vanilla plains, which were made slightly flatter in turn:

Ice Hills: Mountains made of ice covering snow found in Ice Plains, replacing 1/3 of normal Ice Mountains as a technical biome; caves in the mountains also have walls made of snow/ice:

Lake: A biome that is entirely underwater, forming large shallow lakes; islands consisting of plains, forest, jungle, taiga, and desert generate as technical biomes:

Mega Forest: Forest with enormous trees, able to exceed cloud level from near sea level; trees were modified from jungle trees (oak leaves and wood). Regular and big oak trees and bushes (see Bushlands) can also be found. (note that this biome in particular can lag chunk generation due to the size and number of trees):

Mega Taiga: Taiga biome with enormous spruce trees (3x3 trunks), regular spruce trees, and moss stone/cobblestone boulders (the last taken from 1.7):

Mega Tree Plains: Similar to Mega Forest (see above) except trees are much more scattered and there are no understory trees/bushes:

Mesa: Like the biome in 1.7, except caves and ores generate in the clay (stone replaced with clay as a final decoration step) and dirt/gravel pockets are replaced with clay. Dead bushes and cacti, which can be placed on hardened clay, generate. Occasional dead trees (based on big oak trees but not generating leaves) can also be found (I entirely made this myself, not by copying over code from 1.7):

Mixed Forest: A forest containing oak trees, birch trees, spruce trees and small jungle trees, the latter modded to be taller:

Mountainous Desert: A much more mountainous version of the normal desert biome, which, similar to plains, has a slightly decreased max height. Also, exposed stone in mountains is avoided by replacing exposed blocks with sand or sandstone, including inside caves near/above sea level, which can also cut though the surface, same for the normal desert (caves were modded to cut though all blocks except bedrock; floating sand is avoided by replacing sand blocks over air with sandstone, this also applies to beach biomes):

Snowless Taiga: Same as taiga biome but without snow; unlike 1.7, the regular taiga biome is the default snow-covered taiga (which IMO should have been left alone in 1.7):

Spruce Hills: Generates as a technical biome in Mega Tree Plains:

Tropical Swamp: Variant of swamp biome with bright jungle-green grass/leaves and small jungle trees and a great number of water lakes at the surface; average ground level is mostly above sea level otherwise:

Volcanic Wasteland: A mountainous biome with a great deal of lava lakes and lava springs, both on the surface and underground. Mountains are covered with patches of obsidian, cobblestone, gravel, and less commonly grass with occasional stands of trees with few leaves and no branches (i.e. like a volcanic eruption blew them off). Oases of desert, plains, and forest also generate as technical biomes, so the whole area isn't a barren wasteland. In addition, ores of all types except emerald are more abundant in this biome, being found up to 1.5x their normal heights (50% more coal and iron density-wise); magma cubes also spawn, regardless of light level:

Aside from these new biomes and small changes to some existing ones, I also tweaked several existing biomes, such as Extreme hills, which have more trees including spruce trees. Caves are also MUCH more abundant in Extreme Hills, with extra caves generated above y=32 (normal cave systems aren't affected); many of the mountains are truly Swiss cheese, though caves don't cut through the surface unless they are "large caves" (circular chambers) or stone is exposed. Note also that iron ore can be found to y=127 at 1/3 the abundance below sea level, same for everywhere else:

Jungles: Melons naturally spawn in jungles, the only source of melons as melon (and pumpkin) seeds don't generate in mineshaft chests (ETA: readded as of 5/26):

Ice Plains: 2/3rds of Ice Plains were replaced with other biomes (within the normal Ice Plains area, not the entire biome), avoiding vast frozen wastelands, as seen below. Trees also mostly occur in clusters instead of single isolated trees and include spruce trees:

Islands: Islands with actual biomes in oceans are much more common, done by making Mushroom Islands 15 times more common, then making 14/15 of those other biomes (so Mushroom Islands have the same frequency). The min/max height of oceans was also tweaked to make "ocean" islands less common (due to the seafloor rising above the surface, biome is still ocean):

Also of note is that I modded new biomes in even as I was playing my current world; I did so in such a way that existing biomes at the edges of what I explored were unaffected (avoiding sudden terrain changes), but no matter if biomes fully in it were; it is impossible to recreate my world for this reason as the plains biome I spawned in is now a mesa biome when the world is recreated, and spawn is now a few hundred blocks to the south (the game is coded so that only certain biomes are valid spawning areas).

Another change to world generation is the removal of the upper layers of bedrock and lowering of rarer ores (other than iron and coal), as caves go 5 layers deeper before becoming filled with lava; diamond is only found to y=10 instead of y=15 (5 layers above lava in caves).

Here is a comparison between vanilla 1.6.4 and my modded world generation; AMIDST actually does work with my mod but uses the 1.7 biome names in place of mine and shows some villages in the wrong biomes (apparently it looks at the biome ID and not whether it is actually a savanna):

In addition, here is a list of biomes with the (approximate) probability of generating in a given area; the biomes I added together have about the same occurrence as vanilla biomes, but mostly rarer individually:

Now, for non-biome related changes, I modified the generation of many structures:

Abandoned Mineshafts: Instead of generating in any random chunk, mineshafts generate to a fixed grid with a spacing of 14 chunks, generating at 7,0 and 0,7 relative to the grid, with a 40% chance of generating at a point, thus an overall chance of about 0.004 (default is 0.01 pre-1.7 and 0.004 after) while a decrease in frequency within 80 chunks of the origin was removed so they generate at the same frequency everywhere. The size of mineshafts was also made variable, with the default size being 8 sections from the start (dirt room) and the variable size being 5-10 sections, weighted towards the lower end (average size is smaller than vanilla); for example, here is a relatively small one (smaller mineshafts also have a higher chance of chests per length of corridor, inversely proportional to the size, although often still have none):

Based on a look at Mineshaft.dat using NBTExplorer they can contain anywhere from 10 to 275 children (structure components, equivalent to the distance between two supports in corridors, crossings, and stairs), with vanilla mineshafts averaging around 125.

In addition, I fixed the bug noted here, which causes "bubbles" in oceans (also in solid ground) and messed-up connections to the starting room. Astonishingly, despite a fix (which I used) provided over a year ago, Mojang still hasn't fixed this very easy to fix bug (well, yeah).

Caves: Similar to mineshafts, large cave systems are generated every 14 chunks at relative coordinates 0,0 and 7,7, plus a variation of +/- 1 chunk from these points, with a 70% probability of generating at each point for an overall frequency of 1/140 (vanilla 1.6.4 caves are generated with a frequency of 1/15 and 1.7+ caves 1/7); while much lower than vanilla, the minimum size is 16 with a max of 40 (max is 40 in vanilla 1.6.4 and 15 in 1.7+), weighted towards the low end; overall, there are more large cave systems as this comparison between my current world and my first main world (vanilla shows), but as you can see vanilla has more huge cave complexes formed by many cave systems generating in close proximity due to the random placement:

There are also small caves randomly generated across the map, similar to caves in 1.7+, with a size of 10 and frequency of 7. However, in extreme hills, extra caves with a size of 2015 and frequency of 10 generate above y=32, in addition to all of the aforementioned; mesa also has extra caves but a smaller size of 10 and volcanic wasteland size 5/frequency 5.

In addition, large cave systems have a 1-in-50 chance of becoming a colossal cave system, intentionally made to approximate the largest known cave system in vanilla (which has around 120 caves across 6 cave systems generated within a few chunks of each other, determined by having the game print out the size and location of cave systems); they are generated as 6 separate cave systems with a size of 20, plus a size 16 system, within 10 chunks of each other (made so they don't generate too close to each other), otherwise impossible due to the non-random placement mentioned above:

One thing to note in the comparison above is the number of caves that break the surface (green areas); individual caves in large cave systems have a 50% chance of only being able to cut through stone, while small caves have a 100% chance of doing so, except in Extreme Hills.

Also of note, caves and ravines that pass under bodies of water will generate normally but only remove stone blocks, instead of simply glitching out (the game checks for water and normally doesn't generate any part with water in the path); the floating sand removal mentioned above also means that sand under bodies of water won't collapse into caves (sometimes still happens if there is gravel underneath); caves under oceans and lakes are much less likely to be flooded out (a sandstone roof generates if a cave directly hits water, as with exposed stone on the seabed). I also tweaked the generation so that individual caves (not cave systems) and ravines have more variability; caves can get up to three times bigger, but averaging the same size as vanilla, while ravines can be from half to twice as long, wider/narrower, and deeper/shallower, and more curved, again averaging close to vanilla.

Here are several examples of just how big caves can get:

Strongholds: Normally in vanilla caves and ravines "cut" apart strongholds because they are coded so that walls only generate if there are solid non-air blocks where they would otherwise be; I avoid this by modifying the code so that walls are always generated regardless, similar to other structures. Also, I removed code that checks for liquid in the bounding boxes so pieces can generate under water and lava; this avoids stuff like End Portal rooms separated from the rest of a stronghold, barring any other possible generation bugs (End Portal rooms always generate but not other parts) and allows it to generate as fully as it can:

Also, they are more dangerous:

Yes, that is a creeper spawner you see in the first one, with silverfish spawners randomly placed in libraries (as real-life silverfish eat books); dungeons can also have them along with other mobs not found in vanilla dungeons, plus they spawn mobs at a much faster rate, 5-10 seconds and 12/6 mobs for zombies, skeletons, spiders and silverfish; 10-20 seconds and 6/4 mobs for cave spiders, Endermen, and creepers; and 10-30 seconds and 4/2 mobs for witches (vanilla is 10-40 seconds and 4/6 mobs; 4 spawned per cycle and 6 within range):

These dungeons are rarer though, with 36% being zombies, 18% each of skeletons and spiders (vanilla is 50% zombie and 25% each of skeletons and spiders) and 9% each of creeper, enderman or witch dungeons.

Mob spawners were also made explosion-proof (includes TNT), but creepers can still blow up chests.

The upside is that they contain better loot, as other structure chests do, proportional to their rarity (even diamond tools/armor in some chests; of course, rarer than other items), with no useless items (if you want string, just kill some spiders, etc) and more items (chest slots) possible.

Desert Temples: Ever found a temple that just has a cave under it? That's because a mob spawned in the loot chamber and blew it up. Well, not here, as I replaced the pressure plate with trapped chests, with an extra TNT under each one (13 total, meaning a bigger explosion if you set it off), plus an example of chest loot; note the lack of rotten flesh and bones, which is compensated for by adding zombie and skeleton spawners (randomly selected):

Jungle Temples: Similar to desert temples, except the trap was buffed by adding fire charges in addition to arrows (may or may not have both):

These are both rarer though due to all the added biomes.

Witches and cave spiders also spawn naturally, witches at the same rate in 1.7, and cave spiders at twice the rate of witches and restricted to bellow sea level (as they are called cave spiders, not abandoned mineshaft spiders, though you won't encounter more than 1-2 at once outside of them). In addition, giants naturally spawn, only above sea level at 1/5 the frequency of witches; they are also a bit different from vanilla in that they deal 5 hearts instead of 25 (on Normal), drop 20 XP instead of 5, and burn in daylight (given lava damage in addition to fire damage so they take about the same amount of time to die) and set you on fire for longer than normal zombies and all the time.


Updated 6/18 - the inventory screen (only in Survival mode) now shows your "score" and coordinates in the upper-left, stats for ores mined and mob kills (counts 8 common Overworld mobs only) during the current session (not total mined as seen in the statistics) below that (the "R" key switches between a list of totals, percentage of total, number of ore mined relative to coal, and individual mob kill counts), and death point in the upper-right (only if you died since starting the current session; "R" clears this and hides the display):


Ender chests can also hold a double chest of items, done by simply changing the number of slots from 27 to 54:

Other changes are as follows:

Buffed zombies, which can spawn reinforcements (not just call for help) on Normal difficulty, although with a minimum distance from the player (so not in your face), as well as doubling a bunch of values like "leader zombie bonus". Baby zombies can also fit in 1 block high openings, similar to 1.7, and also drop XP (12 XP instead of 5, also the same as 1.7) and items, including picked up items (so you don't have to worry about losing stuff). Also carry more weapons, with axes and pickaxes added, and a 1-in-5 chance of diamond items instead of iron.

Bats drop experience (1-3) when killed, like passive mobs and squid.

Fixed infinite animal panic bug (animals run around forever after getting hit instead of calming down; fixed in 1.7).

Fixed sprint-jumping only adding exhaustion of normal jumping when it should be 4x higher (also fixed in 1.7, leading many people to report huge increases in hunger depletion - but why sprint-jump all over the place? Only PvP really warrants it).

Fixed/reduced server lag due to zombie pathfinding, using a combination of Forge source code and another fix.

Removed enchanted item glint from held items (still present on armor and in inventory).

Distance flown stat only counts actual Creative-mode flying, mainly because of misunderstandings when I post my stats and they see that I've "flown" (otherwise, the game thinks you are "flying" when you sprint-jump or get knocked back by mobs).

Game waits for internal server to finish shutting down when you quit before returning to title screen (displays "Shutting down internal server..."), avoiding chunk corruption and not saving properly, also the cause of worlds not deleting properly (i.e. you quit a world then delete it right after, the server is still saving so the delete fails; then you make a new world with the same name and you get chunks from the first world in the second).

All pieces of armor have the same durability as a chestplate, which may be good or bad depending (i.e. if you made a full set at once they will all break at the same time leaving you with zero protection). Diamond armor is also as relatively durable as iron armor is compared to iron tools with a durability of 1500 (241/251 * 1562), instead of just 1/3 as durable as diamond tools; this does increase the repair cost though (repair cost solely depends on durability, not material).

The amount of protection per armor point was changed from 4 to 3.5% so full armor points provides 70% damage reduction instead 80%, making diamond armor about a third better than iron (diamond tools mine about a third faster than iron, so basically diamond armor has the same advantages as tools do); other types of armor have slightly different amounts of points to closely match with vanilla (e.g. leather has 8 armor points for 28% protection, iron has 17 for 59.5%, up from 7 (4x7 = 28) and 15 (4x15 = 60) respectively).

Added a fix for mob pathfinding that causes a northwest bias over time, particularly noticeable with villagers and likely contributing to their tendency to crowd into one house; from a test I did, they now wander around much more of the village and even recognized more doors (only seen within 16 blocks).

Removed void fog, which is otherwise very dense due to lowering the bottom of the world by 5 blocks (added 5/11; I didn't add this sooner because I just used Optifine to disable it).

Enabled growing Mega Trees and Mega Taiga trees from saplings, in a similar manner to giant jungle trees; see this post for details.

Fixed leaf decay issues with big oak trees by adding extra logs to branches (extending upwards into leaf bunches, instead of ending at the bases); this issue was so bad that they were mostly removed from natural world generation in 1.7 due to lag. 6/4 - a similar fix was done to jungle trees by modifying their branches, although some leaves still occasionally generate disconnected from the canopy.

Saplings grow into biome-specific trees in most biomes; here is a full list of biome-specific trees (regular size trees); otherwise growing as normal:

• Oak trees: Grow as swamp trees in (Tropical) Swamp biomes; exclusively grow as big oak trees in Big Oak Forest. 2x2 trees grow as giant oak trees in Big Oak Forest and otherwise grow as Mega Trees.
• Spruce trees: Both variants (tall type and Christmas tree-like type, only the latter normally grow) grow in Taiga (all variants), Ice Plains and Forest Mountain biomes with 50/50 of each type. In Bushlands and Mega Tree biomes they grow as bushes (excluding the smallest variant, which replaces the ground under it with a log). Only the tall variant grows in Spruce Hills.
• Jungle trees: Generate with vines and cocoa pods in Jungle and Tropical Swamp; grow taller than usual in Mixed Forest.

Also, I decided to add a couple silly things that can be seen as Easter eggs:

These spawn 1/5 as often as witches, only above sea level, and have 50 hearts of health, deal 5 hearts of damage on Normal, and drop 20 XP, somewhat changed from the vanilla values (10 instead of 50 damage, which is a little OP, and 20 instead of 5 XP). Also, like normal zombies they burn in daylight (extra damage done so they die faster than otherwise) and set you on fire for longer (5 seconds on Easy - 15 seconds on Hard) with a 100% chance regardless of difficulty.

Before:


After; note that some forests are now "Mesa Plateau" biomes, such as near spawn, which is now half forest and half Big Oak Forest:

Really? It's supposed to be a secret.