JavaScript GameBoy emulator used from this GitHub repository.
This game continues from a series of several other games, and so has a somewhat convoluted story. The main characters of the story are two Zums, Zap and Zala. After having defeated their first enemy, Zane (who wanted to control of all of the Zums), they are now fighting an evil duck, Ducky. (who also wants to control all of the Zums) Ducky is known for his poor command of written English, his very elaborate (yet short-sighted) evil schemes, and his belief that he is the smartest living thing in existence.
In this game, Zala finds herself trapped inside a maze of puzzles inside Duck Enterprises, with Ducky busy chasing after Zap. She makes her way through these puzzles in an attempt to escape.
You can find the source code at this GitHub repository. The source code of gbasm, the assembler used to build the game, is available at this GitHub repository.