Dangerous Seed  The game was designed by Yuichiro Shinozaki, a character artist for Namco's own "Babylonian Castle Saga" franchise, with music composed by Yoshinori Nagumo. Early versions of the game were known as "Kristallkern", which remains in-game during the end credits. A conversion for the Sega Mega Drive was released a year later in 1990, which included new features such as additional stages and an arranged soundtrack. "Dangerous Seed" was met with mixed reviews from critics — although the game was praised for its graphics, fast-paced gameplay and soundtrack, it was criticized for lacking originality and for being unable to stand out among other similar games. Some reviewers stated it was one of the better shoot'em ups released for the Mega Drive. "Dangerous Seed" is a vertically scrolling shooter video game. The player controls a fleet of ships — Alpha, Beta and Gamma — as they must wipe out the alien race known as Danger Seed before they destroy all of mankind. Each ship features different attack types; Alpha has a standard shot, Beta has a V-shaped laser weapon, and Gamma has the ability to shoot forwards and backwards. All three also have a health meter that will deplete when they are inflicted with enemy fire, and having one of the ships destroyed will cause the player to take control of the next ship. If all three ships are destroyed, the game will be over. The three ships can also find powerncapsules by destroying large "Turtle" enemies that upgrade their abilities, such as homing missiles, "ring lasers" that track enemies, and a melt-missile that dissolves enemies when they are hit. The game spans twelve stages, known as "tubes" in-game, each taking place in planets found in the Solar System. The fifth tube combines the player's ships into a single craft named the Moon Diver, which features all of the weapons and abilities of the three ships and a large health bar. Each tube features a boss fight at the end, which must be destroyed in a certain amount of time before it flees and deducts points from the player's score. Bosses have weak points which must be destroyed before completely defeating it. "Dangerous Seed" was released in Japan by Namco in December 1989, making it the company's final arcade game of the 1980s. It was designed by Yuichiro Shinozaki, who was a character designer for the "Babylonian Castle Saga" franchise.