The basic interface of Crayon Physics Deluxe is about as simple and intuitive as you can get. The screen looks like a piece of paper, and you draw on it using your touch screen or mouse as if you had a crayon. You either already know how to do this, or you're spending your Rumspringa reading video game blogs.
Each level of Crayon Physics Deluxe presents you with a small red ball, and the point of the game is to get the ball to reach a star. It's possible to nudge the ball one way or another, but for the most part it's all about what you draw. The objects you draw take on physical properties responding to forces such as gravity, collisions, and friction. In order to complete each level, you have to figure out what combination of objects will accomplish your task.
Crayon Physics Deluxe essentially becomes an engineering simulation in a way. You can create hinges, ropes, ramps, pulleys, wheels, and even rockets. These can all be combined to create your own makeshift machines as you try to manipulate the ball across the screen.
Sometimes it's fun to replay levels different ways to see what all the game will let you do. I managed to create some fairly elaborate machines in some of these levels. I didn't actually need to, but it was nice that the game let me.
It's not a grand adventure or anything, but as far as mobile puzzle games go, it's a fun distraction that will force you to think and be imaginative..