http://www.thinkgeek.com/geektoys/japanfan/9c83/?pfm=homepage_BestDeals_9_9c83
These toys are very challenging, but they are possible. Keep your mind working when your body is idle. Whenever your not doing something, these little puzzeles will pack alot of mind boggling challenges. You can raise your intelect by just using some craft and skill. They really are neat!