Power-ups come in the form of offensive or defensive weaponry, ranging from machine guns, missiles, mines and rockets to energy shields, autopilots, and turbo boosts.[4][5][6][7] These power-ups are usually collected by flying over coloured X-shaped pads on race tracks.[8][9] Chevron-shaped speed pads also feature prominently on race tracks: once flown over, the player's ship receives a momentary boost.[10][11]