Biohazard Zombie Buster was one of the first mobile games created for the series and to be ported to Western audiences, originally released in 2001 for Java devices the game underwent several ports. In 2003 it was ported to PAL devices and in 2011 was again ported to new devices such as AU, Softbank and Docomo. The game does not seem to have any story and plays somewhat like the game Space Invaders (move horizontally defending your line). There are 30 levels in total with enemies such as Zombies, Yawn and Mr X. When reaching level 30 the game just repeats itself and has no end game.