Virus

The "Virus" arcade machine from 1990 refers to the rare, early prototype version of Dr. Mario. Developed by Nintendo, this game was tested in arcades on the PlayChoice-10 system under its original working title, Virus, before being officially renamed and packaged for its wide retail release.

Differences from the final Dr. Mario

While the core gameplay of matching falling vitamin capsules to kill viruses was intact, the 1990 arcade prototype featured several distinct elements:

• The Title Screen: The game proudly displayed the title Virus in stylized purple text over a blue box, accompanied by an illustration of a syringe on a black background.

• Missing Mascot: Mario did not appear on the main title or selection screens.

• Visual Variations: Instead of the final game's HUD assets, the sidebar featured a frowning, sneezing dog alongside a character resembling Nurse Toadstool. The virus sprites themselves were also different and lacked the animations found in the final release.

• Unique Options: The prototype included internal option toggles, such as a "Fall Down" modifier, virus levels scaling all the way up to 24, and a "Hard" speed setting that skipped capsule animations entirely to quicken gameplay.