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The Humble Weekly Bundle is for Co-op Games.
Pay $1 minimum for:
Awesomenauts (Steam)
Sanctum 2 (Steam)
Wanderlust: Rebirth (Steam)
Pay $6 or more for:
Rocketbirds: Hardboiled Chicken (Steam, DRM-Free)
Ors Must Die! 2 Complete Pack (Steam)
Aces Wild: Maniac Brawling Action! (Steam, DRM-Free)
Pay $10 or more for:
Risk of Rain (Steam, DRM-Free)