From steampowered.com

About the Game

Crayon Physics Deluxe is a 2D physics puzzle / sandbox game, in which you get to experience what it would be like if your drawings would be magically transformed into real physical objects. Solve puzzles with your artistic vision and creative use of physics.

Key features:

Awesome physics  
Over 70 levels  
Easy to use level editor  
Rockets, ropes and hinges