Stunningly beautiful and rich environments make this game a real joy to play and explore. Throw in a couple of friends and online multiplayer and it really shines. Fun puzzles and ample opportunity to goof off and play. Work together or endlessly grief your friends you decide. Top of my list for excellent co-op games! This game is cross-platform compatible so you can play it with any friends who have a mac. This is a great game to play couch co-op on too. You can actually play co-op with 3 people on one computer with one game installation. This can be with either gampad, keyboard & mouse or various combinations. I hope more developers start doing this as well.