You're just a simple little ball lost in the big, bad world. All you have to do is roll yourself to the exit of each level. Sounds simple, right? Maybe it's not quite as easy as it sounds...
Left, right, up, and down are your only choices. Once you set your ball rolling, it will not stop or change direction until it runs into something that forces it to do so. Plan your moves carefully, or your ball may get trapped, or may never stop rolling, and you'll be back to square one!
Mouse, arrow keys, or WASD to roll your ball.
"R" to restart the level
Escape or space bar to pause the game and bring up the in-game menu.
The musical symbol in the bottom-right corner of the screen mutes and un-mutes the game.