Green flag to start and red octagon to stop. click to pop. designed for computer but popping the bubbles will work with touch but changing the minimum and maximum speeds has to computer mouse (in top left corner, if you hover there for 3 seconds it will appear) I would recommend minimum speed around 0 and maximum around 5. you can change the maximum and minimum speeds for a challenge.
Hope you enjoy READ THE INSTRUCTIONS THROUGH click the backdrop or space to change it