Brain Games For Kids And Maybe A Few Adults, Too:
Check out this fun site I found a short while ago! Plenty of fun puzzles and games to exercise your mind.

 
It’s sort-of like the free, school-safe version of Lumosity. Don’t know what the progress tracking is like, though it seems limited to the user themselves.

Some of the games are image-based, others are animated with Flash.

Note: Many of them will seem a bit limited to about high-school level, but if you can get past the graphic-style, they can still give your thought-muscles a little workout…