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The I of the Dragon has not been free before. Has trading cards.
61% positive reviews on Steam
50,000 keys available
Hourly limit: 200 keys
Daily limit: 20,000 keys
Pressure has been offered before. Has trading cards.
200,000 Steam keys for Pressure.
76% positie reviews on Steam
EDIT: Daily limit for The I of the Dragon has been extended to 30,000 keys.
Pressure is an awesome game and includes couch coop.