Mazinger Z (SNES)

Mazinger Z
Developer: Winky Soft Publisher: Bandai Platform: SNES Released in JP: June 25, 1993 This game has a hidden level select.

Mazinger Z for the Super Famicom is a 2D platformer/beat 'em up game based off of the 1970's mecha anime of the same name and was released by Winky Soft, the same team behind the development of the Super Robot Taisen games.

Level Select

Boot the game and wait for the intro to finish. When it changes into the title screen with the red ship flying in, hold A + B + X + Y + L + R and press Start. Then press Right on the next title screen to select your starting level.

(Source: Game tricks Encyclopedia Wiki)