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Might have better luck here: https://www.steamtrades.com/

And it's against the rule to organize trading here at steamgifts

well try these:

RPG - co-op

i corently play The Incredible Adventures of Van Helsing: Final Cut its the full story in one (all 3 games) and i enjoy it, tho i only tried the first game in co-op (my friends dont own final cut)

Lord of the Rings: War in the North is great

Torchlight II is also great

Titan Quest Anniversary Edition is great

fps (and such) co-op

Borderlands also enjoined the 2nd one :)

Dying Light is great, you can also tries Dead Island but its a matter of taste ;)

Just give a shot to Fortnite - it's good and it's free.

Play Warframe. It's free and it's amazing.