Phoenix is a video game set in outer space, very similar to Space Invaders and it was released in 1980. The game was provided in Japan by Taito and in America by Centuri. The mothership is one of the first examples of video game bosses as as a separate challenge, although the definition had not been coined yet. The main enemies are birds that can drop bombs, while the player tries to shoot them down. The ship is equipped with a shield, which can be used for a few seconds to avoid alien attacks. Levels are structured on 5 rounds of increasing difficulty.