Sit down and solve the cube. Use the mouse to turn its faces and rotate the whole thing in your hands. Keyboard controls are there when you want to go faster.
The timer starts with your first move. If you leave before finishing, your cube is saved so you can come back to it later.
Controls
Left mouse drag: Turn a face.
Right mouse drag: Pick up and rotate the whole cube.
Speed keys — F, B, L, R, U, D: Quickly turn a face.