Scramble is often considered the first true shoot-em-up arcade game, as it featured constantly scrolling levels with fixed terrain, enemies both on the ground and in the air and a succession of distinct, increasingly difficult levels. Its graphics and gameplay set the stage for a great many scrolling shooters to come, and it was difficult for its time, requiring constant vigilance against airborne enemies, missiles from below and managing your ever-dwindling fuel levels (it's not entirely clear why destroying fuel tanks on the ground replenishes your ship's fuel supply, but just go with it). Our overlay includes both the American cabinet artwork and the more fanciful Zaccaria art released in Europe.