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The Humble Weekly Bundle is the Co-op 2 bundle.
Pay $1 minimum for:
Shadow Puppeteer
ibb & obb – Best Friends Forever Double Pack
Hero Siege
Beat the average (currently $3.49) for above plus:
Hammerwatch
Damned
Pay $10 minimum for above plus:
FORCED
Contagion
Pay $17 minimum for two bundles.
Pay $30 minimum for four bundles.