Geometric backgrounds, metal frame, and Twin Block
Successfully complete the game again on a cleared saved game file in Uranoid, and Quest Game modes to unlock seven geometric backgrounds, a metal frame, and Twin Block.
Happy Smiling background music
Successfully complete Eta-5 in Uranoid.
Neith
Successfully complete Zone Z' in Quest mode.
Operon
Successfully complete Zone W in Quest mode.
Original Vaus ship
Complete all Quest mode levels.
Revenge Of Arkanoid background music
Successfully complete Iota in Uranoid with a score of at least 400,000 points.
Rhea
Successfully complete Zone V in Quest mode.
Uranoid mini-game
Press R, Left, Right, L, Right, R at the title screen. A sound will confirm correct code entry. An option to play Uranoid will now appear on the single player menu.
Note: This code applies to the Japanese version only.
Uranoid mini-game
Successfully complete all levels and save your friends to unlock the Uranoid option at the main menu.
Uranoid Mode
Complete all levels to save all your friends and Uranoid mode will be available when you return to the main menu.