This is split-up survival, a multiplayer survival map. What it is, is you spawn on top of two areas, one with a bedrock roof, and one with a glass roof. There are two tiny houses, one person goes in each one. You then fall into an area. The one with the glass roof has sunlight, but isn't very deep. The other is deep, and has no sunlight. You can give supplies to the other side through a portal. There is a hole in the wall with a cable in it for the other side to be powered if you use solar power. Technic 7 required. The download is a .zip folder with "rules and challenges.txt" "screens (folder with .png screenshots)" and "split up (the save folder)". PM me the link to any Let's plays, I might link them in the description here. Here are the screenshots (in crappier quility, since they can't have a width over 800).
Houses
from a different angle
Thing you survive in
Inside the bedrock roofed area
Bed-roofed portal
close up
Glass roofed inside
Glass-roofed portal
close up
Rules: once inside you may not build up to the top and leave through the house OR destroy the roof.
You may not destroy the portal or block it.
You may not make any new portals.
You may not go to the nether.
Download: http://www.mediafire.com/?eur1wxhivvii4sn