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Alpha Prime
or
Risen
or
Garrys MOD
or
dear esther
or
Beyond Good and Evil™
or
nexuiz
or
EDGE
or
Nuclear Dawn
or
Jade Empire™: Special Edition
or
portal 2
for 1x CS:GO
Sorry, have all of those already.
Also, I wasn't sure if you were offering a number of games for it, or just pick one out of the bunch.