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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
frosty
One-Button Civ by frosty One-Button Civ
for 1 Hour Game Jam 101 (One Button)

Advance your civilization as the centuries go by... Instructions at bottom of screen.

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