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One of these Steam gifts:

Portal 2
Mount Your Friends
Minimum
FORCED: Slightly Better Edition
Screencheat
Borderlands 2: Headhunter 1: Bloody Harvest
Hack 'n' Slash
Frozen Synapse Prime
Home is Where One Starts...
Advent Rising
Bloodrayne
Bloodrayne 2
SpaceChem
Brilliant Bob
GooCubelets
Break Into Zatwor
The Slaughtering Grounds