Press G and H to try and roll a boulder up a hill. Press G or H to try and drink water or eat a fruit. Press G and H to fill a tub and wash away your sins.
Pippin Barr, a guy with a PhD in 'video game values' has created an 8 bit game that allows you to take the role of some of Hades' most famous denizens. Each task is, of course, impossible, and in a lot of ways it's a commentary on the nature of video games - endlessly questing for some sort of possibly unattainable 'completion' or 'finish.' It's clever and smart and fun.