Sorry, but I just don't see why this would help the game already- we already have soul sand, which slows you down, and as toxic virus said, we have enough brown colors already. This wouldn't help minecraft at all, it would just be a bother and an add-on no one would use. (By the way, let Terraria keep Terraria's blocks)
0% Support- no wait, I guess it's better than some...
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fishg - Fan Thread: "I have to say to it is a good idea. It would be very, very useful for mob traps, adventure maps, and parkour. Everything seems balanced and makes sense within the context of the game."