[Drag a Ball] using your mouse [1,2,3,4, or 5] to add new balls! [D] Delete Ball [R] to Remove ALL balls [Space] Line drawing mode [Q & E] to set portals [L] Load a Scene [S] Save your Scene [B] toggle Scene Borders [Z] Engine Tuner (Gravity, etc) [H] Help (on/off) [P] Pause the simulation
