Survive, do quests, other stuff.
No getting over the barrier blocks
Stay in survival
If you ever run of wood... TO BAD! START OVER!
I know, I know, I am lazy and just cut out some terrain
If you wanna play with more people, just set there spawnpoint at the very edge of the map. (Recommended for 1 person though)
https://www.dropbox.com/s/bbob55g52qmsvpx/2D Minecraft_ Chunk 2v.zip?dl=0