This game looks so innocent and plays like the most average Dr. Mario experience out there, but peeling the layers it just keeps getting more bizarre:

-95% of the cast are random Wario Land 3 enemies
-The division of Nintendo this was developed under is still unknown
-It wasn't released in Japan until two years later despite being entirely developed there, and on an entirely different platform
-Most of the artists that worked on this game were plucked from anime studios and never worked in the games industry ever again
-Nurse Peach appears in official art despite not even existing in the final game
-Octo was retroactively given blackface in later released Japanese version (not making this one up)