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The Humble Weekly Bundle is Simulators 2.
Pay $1 minimum for:
Universe Sandbox (Steam, DRM Free)
Cook, Serve, Delicious! (Steam, DRM Free)
Out of the Park Baseball 14 (Steam, DRM Free)
Pay $6 or more to unlock:
Turbo Dismount (Steam)
Tropico 4: Steam Special Edition (Steam)
Pay $10 or more to unlock:
Euro Truck Simulator (Steam)