The $10 t-shirt deal of the day over at RIPT Apparel is a Tetris-themed shirt called “Solve the Puzzle” by Ninjaink and its designed to bring awareness to Autism (part of the money from today’s sale will go to the Autism Speaks charity).

The sale at RIPT began today, Tuesday, August 7, 2012, at midnight CST, and will continue for 24 hours from then, and once it’s over, it will not be sold on the site anymore.