Tempest Level 99 1981 Phone Case

Tempest is an arcade game released in 1981 that is notable for being the first video game with a selectable difficulty. The game is a Tube Shooter, where the environment is fixed, but is viewed from a 3D perspective. The object is to survive while shooting aliens as they attack from the player controlled spaceship along the near edge of the playfield. The game has 16 unique screens, some of which are tubes that allow the player to fly 360° while others are left to right open fields. When all 16 screens have been played, the sequence repeats with different colors and increased difficulty. Each sequence of levels adds faster and more deadly enemies. The numbered levels stop incrementing after level 99 and become random.