game jam

[ geym jam ]
/ ˈgeɪm ˌdʒæm /

noun Digital Technology.

an event in which video game developers work in groups to conceptualize, design, and build a functioning version of one or more game projects over a restricted period of a few hours or days: The game jam brought students and industry veterans together to create hundreds of new games in one weekend.
Compare hackathon.

Origin of game jam

First recorded in 2000–05; game1 + jam (session)