For almost anyone who grew up playing video games in the '90s, Super Mario 64 was a blocky rite of passage. But it isn't just gamers who have taken to the mustachioed hero lately. More recently, scientists have to begun to test whether games such as Super Mario 64 could be used to keep people mentally in shape, thanks to its colourful landscapes, simple yet addictive puzzles, and open-world freedom. To that end, a study published last week in PLOS One suggested that elderly people who keep up a daily regimen of Super Mario 64 can increase the amount of grey matter in their brain, and even improve their short-term memory.