What's a good co-op game that's free?

[Mikiyikiy]

Tell me dammit. I have a friend who just gave up fpsses and now we don't have anything to play.

[Ad Bot]

[Madmitten]

google free online 2 player games
asking for co-op is like asking for an expensive bike
asking for a free co-op game is like asking for a cruise ship

[IkeTheGeneric]

Notepad online

[luluthe42nd]

Alien Swarm.
/thread
EDIT: It's not an FPS, it's a TPS. :3