This version of Mr. Do's Nightmare is a hack created by Krazy Ivan. It modifies the original Mr. Do's Nightmare arcade game, altering its gameplay, graphics, or other elements.  Hacks of arcade games were frequently created by hobbyists and enthusiasts, often sharing them through various channels.  Information regarding the specifics of Krazy Ivan's modifications would be needed for a deeper analysis of this specific hack. This serves as an example of the community-driven modifications often found in the history of arcade gaming.

Mr.Do's Nightmare (hack by Krazy Ivan)

Mr. Kougar

Mr. Kougar (earlier)

Mr. Kougar (version set 1)

Mr. Kougar (version set 2)

Mr. Lo!

MS Pacman (version)

Ms. Pac Attack

Ms. Pac-Man ('Made in Greece' version)

Ms. Pac-Man (version, encrypted)

Ms. Pac-Man (with speedup hack)

Ms. Pac-Man Heart Burn

Ms. Pac-Man Plus