New co-op levels on americas army. Not Emu related, and you have to do a TON of training to get to the co-op. But you might like it.
See also: Battletoads games, Double Dragon games, Battletoads/Double Dragon games, Final Fantasy 3 has a weak 2 player option, Goldeneye and Perfect Dark on Nintendo 64 both offer 2 controller options(weak and HARD 2 player, i.e. you move, I aim), there was a mech game on PS1 that used the same 2 controller option, anybody know the title? We used to have TONS of fun with No Mercy on the N64, any NBA Jam, etc.
River City Ransom is classic!