Co-Op Experience: 4 Player Online Co-Op - 2 Player Split Screen on 360 Version as well as 4 Player Online.
This is the one game that was on everyone's list this year. Sporting a 4 player co-op story mode in which players attempt to survive the zombie onlsaught, Left 4 Dead has an atmosphere that is like no other game to date. The game was designed from the ground up for co-op play, and it's essential to use tactics and teamwork to survive. Even the game's vs. mode which allows 8 players to play online together has strong ties to co-op. After E3 and PAX this year, it's easy to see why this is our number one anticipate co-op game of the year.
Guitar Hero: World Tour (Multiple Platforms, Neversoft/Vicarious Visions/Activision Blizzard, October 25th) - Guitar Hero's first foray into multiple instruments, can it survive the jump?