Pac-Man 2: Harder Levels / Pac-Challange 2K23

Planned to have multiple mazes and a fifth ghost name (Character: Luster / Nickname: Tinny) who also happens to be a "Super Robot" (an origin being that he was built by "Kinky" from Pac-Man Arrangment). However, he can only appear if the time runs out. Appearing out of the left/right tunnel and rushing to Pac-Man faster than Blinky. This concept will also include the Pac-Soda (which turns the intimidated ghosts invisible), and a speed shoe. However, looking back I don't think that all of this is going to fit to a simple Pac-Man hardware, so that most likely won't happen. The only thing changed for this unreleased version is the alternative ghost names.

Ultra Pac-Man

Same as Pac-Man 2: Harder levels / Pac-Challange 2K23, but this time a trailer dropped on Scratch.mit.edu. The trailer basically brings the concept of the previous version to works Ghosts become invisible when inhaling the soda, the speed shoe boosts up Pac-Man's speed at a decent rate. And Tinny became ineffective when the power pellet was eaten. there was also an NES prototype for the game which updated some graphics and does not include the 5th ghost. Also planned to have multiple mazes, but this time it actually shows the maze colors.

Pac-Man Encore

This version removes the previous concepts instead focusing on a different maze color, different fruits, and smooth graphics (and hopefully different gameplay). There is also updated cutscenes. Maybe there might be more into this hack as long as the hack doesn't reach its hardware limit.