11/18/2009 05:12 am ET | Updated May 25, 2011

Games That Give - Sudoku Never Felt So Good

Games That Give has a simple motto: "You Play. We Donate. No Catch."

That really is how it works. They sell advertising on their site, you play games, they give 70% of their earnings to charitable causes. Major sponsors such as Domino's Pizza, Pepsi, Starbucks and MasterCard are already advertising on the site.

You can also choose which organization the ad revenue goes to. From Breast Cancer Network of Strength to Unicef to Feeding America to MercyCorps, your cause is fairly certain to be covered.

Okay, they said no catch, but I think Sudoku might be even more difficult to complete when the puzzle is laid over the Domino's Pizza logo.

Which organization are you playing for?