Moments Synchronized! A difficult 2 player puzzle map, by me; skyp. One player; escaping a prison to cross the border, and the other; helping, by finding the fuel and getting ingredients to forge a key.
Just note that, this is more like 2 singleplayer maps; in one (and each player plays their half) though in some situations player 1 must help player 2 (and player 1/2 can sometimes see the solutions to puzzles for player 2/1). But, this is not a singleplayer map.