Although Mario & Wario was originally released only in Japan, the game is entirely in English; a US release was planned, complete with box art, yet never materialized. The game would eventually be released internationally as part of the Nintendo Switch Online service in 2025.

Of note is that the scrapped English box art features a logo identical to the one seen on the title screen, and that the game itself contains unused graphics for a Japanese version of the title screen with a logo identical to that seen on the Japanese box art. Combining this with the fact that Nintendo games' title logos rarely deviate from the box art (and vice-versa), this implies that the final game is actually based on an English prototype which was shipped to Japanese retailers by mistake.