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Every Saturday at 20:00 UTC
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Next jam:

Next week is the 200th One Hour Game Jam! Woo! Aaaand it clashes with Alakajam! So participate in whichever jam you wish, One Hour Game Jam will still be here the weekend after Alakajam after all :D
unrelated
Work Safety Caution! by unrelated Work Safety Caution!
for 1 Hour Game Jam 75 (Construction)

Help to uphold construction site safety by all means possible.

One Hour Game Jam is open-source, Get One Hour Game Jam software on GitHub.
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Established 2015