I got a free tablet peripheral for work, and I can't begin to express the sheer childlike joy brought about by the combination of this game and that crappy old tablet. Once you've gotten used to the pen interface, drawing, erasing, and manipulating physics-enabled drawings becomes a breeze. Each level is fairly simple, but different victory conditions with different rewards let you tailor each level experience to exactly the level of difficulty you feel like tackling that day. And of course, once you get comfortable, you can build a level of your own. I'm sure it's entertaining as heck with a mouse, but with a pen it's just fantastic.

Wild, fanciful creations can be used to solve the puzzles - akin to the Incredible Machine - or you can just build a car and let it zoom about a bit (after you give it a bit of a nudge or a powertrain, of course).

Honorable mention: the level load interface lets you freehand draw or erase.

I thoroughly recommend the game. Even if you only play for a few hours, you'll never regret your purchase.

This fun simple game is quite addictive, I got my whole office to waste the entire day. It was try this try that. Great purchase