Mario IV is a hack of Armadillo released some time in the early 1990s.
The main differences with Mario IV include a different title screen and the main character being replaced by Mario. Some of the graphics were taken from from Dian Shi Ma Li and Super Mario Bros. 3. An alternate version of the hack has a stage select that allows the player to start from any one of the 8 worlds.
Mario IV's origin is unknown. It is possible that it shares a developer with 7 Grand Dad, due to Mario IV's numerous releases having an nearly identical PCB to said game. It is also somewhat hinted that the J.Y. Company released it at some point.
- One of Mario IV's PCB reads 911223, suggesting it was either first released very early into 1992 or had already hit the markets on or later than December 1991.