Go back to where it all began. You're GES B 09 and GES B 10. You've been created to be perfection, and maintain it. LAnCE is testing again, and you're working with a partner this time. Make your way through mind-numbing co-op puzzles. 

This map requires no mods whatsoever. It also requires no texture pack. However, I do recommend Default or Faithful.
This map needs TWO people. No more, no less.