• Original Mode for Old that allows you to access secret rooms even if you die. Enter at Old mode's title screen: L, R, L, R, L, R, RIGHT, SELECT
• Power-up Mode for Old. Enter at the Old Mode title screen enter: SELECT, R, L, LEFT, RIGHT, R, SELECT, RIGHT
• Super Game mode – Old. Beat boss in Super mode with 2 players. Enter code at Old title screen: LEFT, R, LEFT, SELECT, LEFT, L, LEFT, SELECT
• Super Mode – New. Select a save file, and go to the New title screen and enter: RIGHT, R, LEFT, L, SELECT, R, SELECT, L

Go to the title screen of New Version and input RIGHT, R, LEFT, L, SELECT, R, SELECT, L to play Super Mode on New Mode. Start a game on Super mode in the New version of Bubble Bobble and opt to quit (give up). Once you are on the New Version's title screen, press B to back-up. Choose the Old Version and Super Mode should be playable.

Status: unverified