Videogames to play with 3 friends?

Hey, I was wondering if you guys could recommend some games to play on PC with three friends.

So far I could think of:

Borderlands

Rocket League

Well Lara Croft and The Temple of Osiris is a must have it features both on and off line co-op and you can mix them too.

@Lulu_Lulu: oh yeah I remember that one. Thnx

Broforce!

Beat em ups are always a blast on a keyboard. Castle Crashers and Streets of Rage Remake are fun.