Ozma Wars
Gameplay. The player controls a spacecraft which must fend off UFOs, meteors, and comets. Instead of lives, the player is given an energy reserve that is constantly diminishing; getting hit by the enemy causes gameplay to stop momentarily and a large amount of energy is depleted. Every so often, a mothership will appear and dock with the player's spacecraft, allowing the energy to be refilled. There are 3–4 recognizable stages as the game progresses and new enemies begin to appear. After these, the mothership will appear, and the cycle starts over; this continues indefinitely until the energy  reaches zero. Due to the game being monochrome and a conversion kit for "Space Invaders", many "Ozma Wars" monitors used the "Space Invaders" color overlay. Legacy. There are two bootleg versions of this game called "Space Phantoms" and "Solar Flight". In "Space Phantoms" the player's ship looks like an angel, and the enemies appear as different types of insect.