Ozma Wars

Ozma Wars is a 1979 fixed shooter arcade game, which has the distinction of being the first arcade or video game that SNK, now SNK Playmore, ever developed. In fact, at the time of its creation the company was still known as "Shin Nihon Kikaku". The game is also known as the second ever vertical shoot 'em up game, after Taito's Space Invaders (which ran on the same arcade hardware), but is also additionally known as the first game with disparate "levels". The player controls a space ship which most fend off UFO's, meteors, and comets. Instead of lives, the player is given an energy reserve that is constantly decrementing; getting hit by the enemy causes gameplay to stop momentarily while a large amount of energy is depleted. Every so often, a mothership will appear and dock with the player's spacecraft, causing the energy to be refilled. There are 3-4 recognizable "stages" as the game progresses and new enemies begin to appear. After these, the re-filling ship will appear, and the cycle will start over; this occurs indefinitely.

There are two known 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 insects. Due to the game being monochrome and a conversion kit for Space Invaders, many Ozma Wars monitors still utilized the Space Invaders color overlay.