Tempest is a 1981 arcade game by Atari Inc., designed and programmed by Dave Theurer. It takes place on a three-dimensional surface divided into lanes, sometimes as a closed tube, and viewed from one end. The player controls a claw-shaped "blaster" that sits on the edge of the surface, snapping from segment to segment as a rotary knob is turned. Tempest was one of the first games to use Atari's Color-QuadraScan vector display technology. It was also the first to let players choose their starting level (a system Atari called "SkillStep"). This feature increases the preferred starting level, which therefore could also be used to allowing the player to continue the previous game if they wished. Tempest was one of the first video games with a progressive level design where the levels themselves varied rather than giving the player the same layout with increasing difficulty.