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Bundle Stars has the Crazy Machines Bundle on sale for $3.99.
Includes:
Crazy Machines
Crazy Machines 1.5
Crazy Machines 2
Crazy Machines 2: Back to the Shop DLC
Crazy Machines 2: Halloween DLC
Crazy Machines 2: Happy New Year DLC
Crazy Machines 2: Invaders from Space DLC
Crazy Machines 2: Liquid Force DLC
Crazy Machines 2: Time Travel DLC
All activate on Steam.