There's something about having to calculate simple math as quickly as possible that is sure to deliver wrong answer most of the time. Playing Brain Age is notorious for that. You want to be as fast as possible to prove to your Nintendo DS that your 'Brain Age' is younger than your actual age.

One of the many tests in this title is a math quiz. The questions start fairly simple. 9 + 8, 2 x 5, stuff like that. The questions get harder as you progress, but not by much. It's a combination of trying to beat the clock with the no-as-responsive touch screen as you quickly write a 4 and it thinks it's a 9, giving you a wrong answer while giving you high blood pressure.