Willy does the Great Pyramid!

Willy does the Great Pyramid! is a stand-alone mod of Jet Set Willy. As the title implies, the mod is set inside a "Great Pyramid". The gameplay remains similar to the original game: Willy must collect all the items in the game, while avoiding running into enemies or harmful objects. Any contact with a hazard instantly takes away a life and returns the player to the start of the room. The rooms in the game are connected in various ways and the environment can be explored in any order.

Compared to the original Jet Set Willy, the engine has undergone some modifications; among the new features are monsters that move diagonally, monsters which move in only one direction and teleport back to the start at the end of their path, and different sprites used for the lives counter in every room.