The Flintstones: The Movie (Game Boy)

The Flintstones: The Movie
Developer: Twilight Publisher: Ocean Platform: Game Boy Released in US: December 1994 Released in EU: 1994 This game has a hidden level select.

Stage Select

Enter the options menu, now select the "FX TEST" option and play the sounds: 25, 01, 02, 02, 01, 04, 01, 02, 02, 01, 04, 15. Now play any sound one more time to enable the cheat. Return to the title screen, the message "CHEAT ON!" will appear at the upper-right corner of the screen. Now choose the "START" option. The level/mini game select screen will appear. You can select and play any mini-game, watch the ending sequence, other game sequences and play from any act as well. During the game, Select may also be pressed to skip the level.

Interestingly, if one converts the numbers of the sounds needed to be played to their corresponding letter (e.g. 01 = A, 02 = B, etc.), it spells out "YABBA DABBA DO", Fred's catchphrase.