People who donate get points, which they can use to "buy time" for any particular game on the list, and gaming stops when the donations do. Games already gaining traction include Amnesia, Bastion, CarneyVale: Showtime, Cave Story, Digital: A Love Story, Dungeons of Dredmor, Escape Goat, FTL, I Wanna Be The Guy: Gaiden, Pocket Planes, QWOP, The Dishwasher: Dead Samurai, and tons more. Whew.
Last year the Indie Games for Good marathon lasted 79 hours and raised close to $7,000. More than $4,000 has been raised in pre-marathon donations this year. Good luck, gamers for good.