Arcade versionThe coin-op arcade version of this game was such a success, rumor has it that it caused a coin shortage in Japan.
Konami CodeThe NES version was the first game to use the famous Konami Code.
BBC Micro conversionA & B Computing reported in 1987 about a BBC Micro port that was developed, but never finished. The programmer was later revealed to be Kenton Price.
NES versionIn the arcade game, players could carry up to four options. Due to technical limits of the NES, here they can only have two.
X68000 supplementGradius was bundled with the X68000 computer in Japan, which enforces its status as a "killer app".
Contributed by Satoshi Kunsai (1817) on Mar 27, 2004. [revised by : Patrick Bregger (98671) and Trypticon (6003)]. -- edit trivia