Games++

games++ is a free 12-hour game development event where participants build games from scratch over 10 hours, then put down their mice and pencils so the public can play their creations. Individuals and teams of all ages and experience are welcome - last year we had over 120 participants and hope you will join us!

Designed as a collaborative, communal making experience, games++ incrementally adds to the pool of amazing, experimental, unique, one-off games in the world.

http://gamesplusplus.org/