A galactic battle begins. The BYDO Empire of mutant extraterrestrials is back with evil intent and awesome power. Now the evil empire is poised to launch a new attack on Earth. Only the revolutionary R-9, the planet's most advanced form of defense, stands between these monsters and doom.
Fight through seven challenging stages - picking up power-up items as you progress - on the way to each stage's memorable boss. Is the BYDO Empire invincible? You'll need lightning reflexes, intuitive moves and a big dose of cosmic luck to hold your own. Better prepare yourself, because the mutants "R" ready for you.