Say goodbye to the sun. The Bedrock Box is a randomly generated Minecraft world with a sheet of bedrock in the sky, leaving the world in total darkness. You spawn next to a lone torch, left to fend for yourself. Good luck. (Best played on Normal or Hard difficulty.)
Goal: Get all the regular Minecraft achievements. There is a stronghold in the world but eye of enders won't lead to it when you throw them. To make up for this I placed a sign somewhere in the world with the coordinates of the stronghold.
If you spawn in the correct place, type /spawnpoint and start your adventure. If you spawn on the bedrock, go into creative mode and break through it, then type /spawnpoint on the ground, then go survival and start your adventure. Be sure to replace the bedrock you broke.