Multiplayer shoot em up games for PlayStation 3 with 2-player online support
Ugly Americans: Apocalypsegeddon
Players: 4 local, 4 online
Shoot Many Robots
Players: 2 local, 4 online
1942: Joint Strike
Players: 2 local, 2 online
Alpha Mission II
Players: 2 local, 2 online
Metal Slug: Super Vehicle - 001
Players: 2 local, 2 online
Resogun
Players: 2 local, 2 online