The Guard was a character in Escape Puzzles: Pentagon. It was removed after Gray and his testers couldn't get it to move correctly. As stated by Gray, "It would work much better if I could program!"
The guard, upon a player starting a level, would move one tile for every two the player did. It would take the most direct path to a player; this was what got it removed as, with the player's movement, the most direct path changed all the time.