Bottle Rocket has Doodle Bomb: Physics Puzzle with a Bang (iTunes Link) in the iTunes App Store for FREE (normally $1.99) for a limited time.

Blast your way through 65 mind-bending physics puzzles as you guide your hero to the ultimate goal of “Bomb Master”. Interact with unique physics driven machines and characters who will help (or hurt) your attempt to infiltrate the enemy base using as few bombs as possible.