This game might seem a little bewildering at first, but stick with it, because Fantastic Contraption is an excellent game.
The game consists of a series of puzzles, all based around trying to get a pink wheel into a pink area of the board by building fantasic contraptions to move it there. Clear as mud? It's very hard to describe, just give it a try. The contraptions, which can be built from materials provided at the top of the screen, follow basic rules of physics, so there is a logic to the whole process.
At the last count there were 21 levels to play, but I believe one of the priorities of the author is for there to be 40 levels. One really great inclusion is that having built a successful contraption, you can then see other people's contraptions for that level, and some of them are truly fantastic!