This game has a hidden level select.
An... interesting miscellaneous-themed game featuring a potato-shaped dog. The game's packaging advertises that the in-game music was written by Japanese comedian George Tokoro, who had his own video games.
Game Genie codes 001-A9F-F76 + 001-AEF-6E6 will start the game in a stage select. Select the first option to go to the next stage, the second option to go to the next selection menu, and the third option to start on the previous stage.