Day 4 has come of the Steam Summer Sale extravaganza - and the co-op goodness keeps coming. There's six co-op titles on sale today from the big names to the little unknowns.
Two Worlds 2 - $17.00
Transformers: War for Cybertron - $7.49
Modern Warfare 2 - $19.99
Kane & Lynch 2: Dog Days - $4.99
Men of War: Assault Squad - $8.74
Arma II - $19.99
Tempted to pick up Assault Squad as I've heard good things about the series. K&L 2 should be worth that coin as well if you haven't played it.