Midway Games has announced that a playable demo of Touchmaster DS, Midway's collection of popular touchscreen interactive games, will be available at the following retail stores GameStop, Target, Game Crazy, Fry's, Best Buy, Toys R Us, Wal-Mart and Circuit City. The demo will feature the Crystal Balls puzzle game, one of 23 touch screen games that will appear on Touchmaster when it ships to stores on June 25. Press 'read more' for descriptions of all seven games in the "Puzzle" category, including "Crystal Balls" - new screenshots have been inserted in our gallery.