- Doom II
- Halo CE
- Streets of Rage 2
- Dungeons & Dragons: Shadow over Mystara
- Halo 2
- Halo 3
- Gears of War
- Diablo 2
- New Super Mario Bros Wii
Haven’t played a lot of co-op but those were always a blast whenever playing with friends.
If anyone’s interested in Halo 2 on PC, Project Cartographer brings online support back. If we’re talking Halo 1, the original PC release and Custom Edition still work fine online, even now. Custom Edition is actually a favorite with a few friends of mine, a lot of amazing custom maps and mods on that one. I’m not sure anyone’s figured out any way to do co-op unfortunately in either game.
It’d be great if a couple of us played a game or two though.