Yume Penguin Monogatari

Your girlfriend dumps you because you're too fat, so you try to win her back by slimming down. All while your rival and his henchmen throw food at you.

Anti-Piracy
As with most of the games Konami has published after 1990, this game features a form of copy-protection. When booting the game, it performs a self-test, checking for the presence and integrity of a CHR bank with copyright tiles; part of the copyright-message screen contains the string "&copy; KONAMI 1991", and the copy-protection routines check for that string. If the tests fail, the game switches to "pirate" mode.

In a normal game, Penta gains weight after he eats food (voluntarily or otherwise.) If his weight is too high, then he has to start the stage again. In "pirate" mode, a single piece of food makes him grow obese - which makes clearing the stage under the weight limit much harder.

Unused Text
The game script makes a reference to a race between Penta and Genji, the main antagonist. While there are stages where you fly a plane, you never race against anything other than the stage timer. This text is located at address in the ROM.