To unlock Slideshow mode, beat any three themes.

Collect the following numbers of stamps to unlock the corresponding bonuses. One stamp can be 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.

STAMPS - HOW TO UNLOCK
1 stamp - By The Numbers training mini-game
3 stamps - Stamp Design mode
5 stamps - Battle mode for Sum Totaled mini-game
7 stamps - Tips mode
10 stamps - Change Maker training mini-game
12 stamps - Virus Buster training mini-game
15 stamps - Comment Settings
17 stamps - Change Pin Tip mode
20 stamps - Triangle training mini-game
23 stamps - Calculations X 100 Hard mode
25 stamps - Multi Tasker training mini-game
28 stamps - Triangle Math Hard mode
30 stamps - Multi Tasker Hard mode

Speak the words "Brain Age Express" into the microphone to surprise Ruyta Kawashima and make his head multiply.

When solving how many people are in the house in Multi-Tasker, the number that appears the quickest when written is the answer.

To unlock Challenge mode, have a Brain Age score of 20.