Fantastic contraptions is a physics based game where you make cars using tools to build them. It is extremely fun and I would recommend this game to just about anyone!
It's $2.99 at the app store so go check it out if you are a fan of this genre of games or just want to waste some time. You can also post your created levels online for the world to play. I like posting extremely hard ones and seeing if anyone can solve them:D
I'd rate it about 9.9/10