Saints Row, Trine 2, Sanctum 2, Payday, Monaco, Torchlight 2, and Orc Must Die 2.
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A kind of obscure game that is pretty fun, that I've enjoyed so far, is Greed : Black Border.
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By any chance, did you get past the first boss alone? Seriously, I cannot do that. I get about half of his HP down, and I just die.
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Actually, I haven't tried CO-OP yet, but Hamachi solves everything, my friend! If that fails, try GameRanger.
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Resident Evil 5, Company of Heroes (not strictly co-op, but can be played co-op and is awesome), Magicka.
+1 for Trine 2, Portal 2 and Orcs Must Die 2.
These are all great games that you should be playing with your friend(s).
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only recently got the first, only 9 cheevos left...cba with the underdome on my own. Been looking to get the 2nd, sadly though, i'm poor now :( lol PPL say 1st was better anyway?
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Payday 1 & 2 are great, especially if you like tough and tactical
There's a co-op aspect to Team Fortress 2 which is F2P
Boarderlands 1 & 2
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Lord of the Rings: War in the North
Resident Evil 6 (It's better than 5, don't go with the mindless hate if you can tolerate 5, 6 is better. Both are a terrible Resident Evil game but both are pretty fun for co-op)
Shoot Many Robots
Dead Island and Riptide
Saints Row 3&4
Sacred 2 Gold
Trine 1&2
Rainbow Six Vegas are co-op I think
Terraria
Renegade Ops
Magicka
Hunted The Demon's Forge
and then of course what everyone else has already said.
EDIT: Sorry about lack of commas, forgot SG hates lists...
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Killing Floor - Which I just found is included in the Indie Gala!
Dark Souls
Hunted: The Demon's Forge
Borderlands
Left 4 Dead
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Saints Row: The Third.
Sanctum.
Borderlands.
Terraria.
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Guns of Icarus Online (A steampunk airship combat game has a crew of 4 (pilot/engineers/gunner) per ship and 2-4 ships on each side. It's got a pretty good community.
Or if you just want FPS Borderlands is great (I played it splitscreen on 360 but sure on steam is still fun).
Also Have a look at co-optimus listshere. Most of these should be on steam and you can filter by online/splitscreen/lan co-op etc and sort by rating (they have a separate rating for co-op).
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Party of Sin. At first comes across as a Trine rip-off, but is actually more entertaining in my opinion. It's hard to tell with just an image, but the wiggle animation for this first boss was hilarious PoS narwhal
And as others mentioned one of the best co-op games I've ever played.. terraria.
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Alien Swarm & Zombie Panic Source are pretty fun F2Ps.
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