I just thought I'd add some corrections...

First, the unlockable games are unlocked over a period of time. The last game comes at 20 stamps on the Brain Age calendar. Many of the games become very challenging and stay challenging to just about everyone. Head Count and Triangle Math both have hard modes which keep the game challenging.

Second, you said: "One of the exercises is reading aloud from text on the screen -- in one case, Jane Austen's Emma. Do I need a game system for that?" Reading out loud forces you to read and enunciate every word. This helps improve your reading ability and your reading speed, which is why it times you. Many average people have trouble in this area. Reading is still a good thing, right?

Thirdly, the Sudoku has three areas, basic, intermediate and advanced. Advanced unlocks itself after you finish an intermediate puzzle within 15 minutes. No, it's not up to par with other Sudoku games, but at least there is something there to give a Sudoku fan a challenge.