Most puzzles require quick thinking.
The game also does a good job of not outstaying its welcome. Only a few exercises are initially available, with more being unlocked depending on how many days you've played. Brain Training also only records your scores (both for brain age checks and individual exercises) once a day, although you can do the exercises as many times as you want. This makes Brain Training something you should only really play for about half an hour each day -- perfect for those with short attention spans.
While the exercises are varied, Brain Training could definitely use some more. After a few weeks of play, all of the exercises will be uncovered, making for a fair bit of repetition for the rest of your time with the game. On the plus side, Brain Training also has a cool extra -- dozens of Sudoku puzzles accessible from the main menu. The addictive puzzle game should help players kill even more spare time when not in proper Brain Training mode.
As good as the game's handwriting and voice recognition are, they're still not perfect. Brain Training will, on occasion, refuse to recognise numbers, letters or voice commands -- and it'll usually do this at critical times when you're trying to beat the clock. It can lead to some frustrating moments.
The game's presentation could also irk some people. Dr Kawashima is represented in the game as a sort of Japanese Max Headroom, always bobbing up to give advice or encouragement. Some of his comments can be a bit grating and patronising. But for the most part, the presentation is clean and bright.
Dr Kawashima's Brain Training has some faults, but its positives definitely outweigh it little quirks. We're not sure whether it can actually increase you brainpower, but Dr Kawashima's Brain Training: How Old Is Your Brain? is a fun and addictive addition to the DS stable.