Drag the edge with the mouse to fold, drag the middle to move. Drag and draw. Drag with the mouse (by the edge to fold, middle to move) Press [1,2,3,4] to select paper sizes. Press [Space] to flip the paper over. Press [U] to undo the last fold. Press [Arrow Keys] to zoom in and rotate. Reset the project after around 7 folds otherwise things can get slow!
