Brain Age Express - Math - Platform: Nintendo DS Challenge mode: --------------- Have a Brain Age score of 20 to unlock Challenge mode. Slideshow mode: --------------- Successfully complete any three themes to unlock Slideshow mode. Unlockables: ------------ Collect the indicated number of stamps to unlock the corresponding bonus. One stamp is earned each day that a training mini-game is completed. Note: To play the Virus Buster training mini-game, you must have earned a stamp for that day. By The Numbers training mini-game: 1 stamp Battle mode for Sum Totaled mini-game: 5 stamps Stamp Design mode: 3 stamps Tips mode: 7 stamps Change Maker training mini-game: 10 stamps Virus Buster training mini-game: 12 stamps Comment Settings: 15 stamps Change Pin Tip mode: 17 stamps Triangle training mini-game: 20 stamps Calculations X 100 Hard mode: 23 stamps Multi Tasker training mini-game: 25 stamps Triangle Math Hard mode: 28 stamps Multi Tasker Hard mode: 30 stamps