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The Humble 2K Bundle is live.
Pay $1 minmum for:
BioShock
The Bureau: XCOM Declassified
The Darkness II
Beat the average (currently $7.26) for:
BioShock 2
Mafia II
Spec Ops: The Line
Pay $20 or more for:
XCOM: Enemy Unknown
BioShock Infinite
Bonus games will be unlocked later.