Came across this during a Sunday browsing and loved it. Its a computer game, designed to run on a PC and requires you to draw items on a screen to solve what seem at first simple puzzles. It has a “kid” feel to it but trust me some of the puzzles will get your grey matter working hard. Its very well designed piece of software and can teach kids (probably 6+) a great deal about simple physics whilst having a great deal of fun.
Best thing is that until Jan 15th you pay what you feel the game is worth. Try the demo for free first but I challenge you not to get hooked.