I bring to you: 1 Chunk Survival. The newest, and onlyest map by me (Not any more!). in case you don't know, 1 Chunk is 16x16x256 blocks, that's 16 blocks long, 16 blocks wide, and 256 blocks deep (Including air). The point of the map is to survive in a world that is only one chunk, the rest is just an endless drop into the void.

Rules: No jumping off the edge to replenish your hunger or health.
No making bridges to the mainland.
The only mods that you can use are ones that don't really change gameplay, like making Endermen not be able to pick up blocks, or making torches light up when you are holding them, etc.

The schematic is the world download.