Any good co-op games?

portal 2

left 4 dead

Payday the heist

Dungeon Defenders

Saints row the third

Magicka

dead space 2?

Splinter Cell Chaos Theory. And Conviction's co-op isn't that bad either, but it can't beat Chaos Theory in co-op.

Borderlands 1 and 2

Local or on-line co-op?

Dead Island!

Killing Floor.

Fear 3
Orc Must Die 2
Borderlands 1 & 2

Board Game: Horror of Arkham.

Sven Co-op - Half Life 1 Mod
Torchlight 2
Jamestown - Offline only
Castle Crashers
And I believe the shank games have co-op as well.

COD:MW 2, 3

last I played was Hunted: The Demon's Forge
exactly tailored for 2 players, pretty fun Hack'n'Slash title

http://www.steamgifts.com/forum/search/co=op

Serious Sam 2 or 3?
I loved Co-Op!

Any good zombie games? except L4D and DI

If you and your friend like shoot 'em ups, give Gundemonium a try.

torchlight 2

Killing Floor

Shoot Many Robots

both borderlands

Terraria

Serious Sam HD, according to your avatar :)

Amnesia.

DOTA！

Lara Croft and the Guardian of Light

Awesomenauts

Orcs Must Die! 2

Borderlands 2

Shoot Many Robots

Gatling Gears

Dungeon Defenders

Dead Island

F.E.A.R. 3

Castle Crashers