Comparing genres and sales

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Welcome to VGChartz!
Well, you've come to the right site for what your looking for. Anything you need should be located in the game database, or in the compare games page.
Search For Game Data Here: http://vgchartz.com/games/index.php?name=&console=&publisher=&genre=&keyword=&order=Last+Updated

Here's an example:
Brain Training: http://vgchartz.com/games/game.php?id=2948

Also, here's a chart showing weekly sales of some Casual DS games you mentioned:
http://vgchartz.com/swlaunch.php?reg1=All&game1=Brain+Training+-+DS&reg2=All&game2=Big+Brain+Academy+-+DS&reg3=All&game3=More+Brain+Training+-+DS&weeks=100&weekly=1