In the game Roboclaw you control a robot arm (or rather a claw) and the goal is to grab the ball with your claw and place it in the circle without touching the obstacles.
It sounds simple but as the levels advance there are more and more obstacles that eventually even start moving to make it even harder.
And to top that off there is also a timer so that you don't move too slow.
I couldn't put this one down till I finished all the levels :)
Play the game
Here are the level codes: