clipped from: brainden.com   
fifteen - enlarge picture
oslik - enlarge picture Oslík (113 KB) - get the yellow square out through the bottom edge (tease your mind).
atomic - enlarge picture Atomic (198 KB) - move atoms in a maze to create a molecule and all that in a time limit.
Triogical - enlarge picture Triogical (4156 KB) is a free (freeware), puzzle-type game. Collect all Klondikes by using 3 robots - pusher, grabber and zapper (99 maps).
PocoMan - enlarge picture PocoMan (1045 KB) is another brain game like Soukoban with a bit more complicated mazes.
soukoban - enlarge picture Soukoban (144 KB) is a classic brain game for all ages. The objective is to push given cubes to a certain position in a warehouse.
Here are my favourite free brain games for all ages (a. k. a. puzzle games or mind games - typical brain food), that you can download as zip files.