MAR10 Day—yep, that’s March 10th—is Nintendo’s unofficial holiday celebrating one of the most iconic video game characters of all time: Mario. Why March 10? Simple—“MAR10” looks like “Mario” when written out. Since the early '80s, starting with Donkey Kong in 1981 and then blowing up with Super Mario Bros. in 1985 on the NES, Mario’s been the face of Nintendo and a staple in pretty much every millennial’s childhood. Over the years, we’ve seen major milestones like Super Mario 64 in 1996 (game-changer for 3D gaming), Super Mario Sunshine in 2002, and Super Mario Galaxy in 2007. Every March 10th, Nintendo drops deals, new releases, or fan content to keep the nostalgia alive. If you grew up blowing into cartridges or grinding through Mario Kart battles on the N64, this day’s basically built for you.