This page details bugs of Pac-Mania (NES).
Trapped Ghosts#
Ghosts can be trapped at the entrance of the ghost house by eating a Power Pellet before it leaves it and eating it while vulnerable, which will cause the ghost eyes to get stuck until Pac-Man dies or finishes the stage.
This bug can only be triggered naturally in Sandbox Land, but with the use of cheats it can be used in all stages.