Bodies: 0 Gravity Constant: 1 Tracking: OFF Mass: 16 Press H for instructions.

Click to place a body.

Scroll or use arrow keys to change mass.

Drag to give it a velocity vector.

Press space to create a cloud.

Press K to fill the screen.

Middle-click or shift-click and drag to move the viewport.

Shift-scroll to zoom.

Press C to track the most massive object.

Press D to delete all bodies not on the screen.

Press Q/A to increase/decrease the gravity constant.

Press P to pause/unpause.