Unlock Challenge Mode
Get a Brain Age score of 20.
Unlock Games/Modes
Collect the following number of stamps to unlock the corresponding game/mode:
By the Numbers Minigame - 1 Stamp.
Battle Mode for Sum Totaled Minigame - 5 Stamps.
Calculations X 100 Hard Mode - 23 Stamps.
Change Maker Minigame - 10 Stamps.
Change Pin Tip Mode - 17 Stamps.
Multi Tasker Minigame - 25 Stamps.
Stamp Design Mode - 3 Stamps.
Tips Mode - 7 Stamps.
Slideshow Mode - Complete any 3 Themes.
Comment Settings - 15 Stamps.
Multi Tasker Hard Mode - 30 Stamps.
Triangle Math Hard Mode - 28 Stamps.
Triangle Minigame - 20 Stamps.
Virus Buster Minigame - 12 Stamps.