Mario Day (often written as MAR10 Day) is a yearly celebration of Nintendo’s iconic character Mario and the Super Mario franchise, held every March 10.

What Is Mario Day?

  • Mario Day is an unofficial-turned-official fan holiday dedicated to Mario and his games.
  • It’s celebrated on March 10 because the date “Mar 10” looks like the word “MARIO” when written as MAR10.
  • Nintendo formally embraced and promotes the day, often with Mario-themed content, events, and store discounts.

Why March 10 Matters

  • Fans noticed that writing the date as Mar.10 (or MAR10) visually spells out Mario’s name, and the idea caught on across gaming communities.
  • Over time, this fan-made observance turned into a widely recognized gaming “holiday,” with social media hashtags like #MAR10Day and #NationalMarioDay.

How People Celebrate

  • Playing classic or new Super Mario games, alone or with friends and family.
  • Dressing up as Mario, Luigi, and other Mushroom Kingdom characters, and sharing photos online.
  • Joining themed events, charity streams, or fundraisers—some organizations use MAR10 Day to raise money for kids’ gaming stations and hospital play programs.
  • Taking advantage of Mario-themed sales on games, consoles, or merchandise offered around March 10.

A Bit Of Background

  • Mario first appeared in 1981’s Donkey Kong (as “Jumpman”), before starring as a plumber in Super Mario Bros. and becoming Nintendo’s main mascot.
  • The Mario series has sold hundreds of millions of copies worldwide, making it one of the most popular and influential video game franchises ever.

In short, Mario Day is a playful, fan-driven celebration on March 10 where the gaming world pauses to honor Mario’s long-running impact on games and pop culture.

TL;DR: Mario Day (MAR10 Day) is a March 10 celebration of Nintendo’s Mario, named because “MAR10” looks like “MARIO,” marked by gaming sessions, cosplay, events, and special promotions.

Information gathered from public forums or data available on the internet and portrayed here.