MONSTER PARTY NINTENDO NES

You are a young boy with a baseball bat named Mark. On your way home from a baseball game, you encounter a monster named Bert. Bert needs your help to save his planet from evil monsters. You learn how to merge with Bert and become a monster-fighting gargoyle. You'll spend most of the game attacking bad guys by throwing your bat at them or shooting them.

This is a side-scrolling adventure, similar to Super Mario Bros., but with monsters and skulls. The game itself is infamous for its weird quotes.