Adult Brain Games

I'm looking for a gift for my boyfriend's mother. We came with the idea of its games. She really loves sudoku and crossword puzzles. Her family has already given his hand to play Sudoku. It is also often games.We cards online have been thought to her a DS and games like Brain Academy, etc. However, poor students, this is not our own budget.

The question is therefore:
Does anyone know any PC games Brain Training?
It was not a DS or a Wii (no console games please).

Please and thank you. ^ _ ^

poor students! While it doesn't matter being poor if you are studying

And here is a small part of the brain very well free

http://www.meez.com/games.dm?game=Dr. 20% ...