I don't think must-play games exist.Are you talking about it in the literal sense? Please don't be obnoxious
i just think people respond to different games differently and have different tastes to the point where one persons GOAT wouldnt be mine vice versa. i think breath of the wild is the greatest game ever made but some people dont respond to it and im not going to suggest its a must play.
additionally, games that are true pieces of art (WW, Super Metroid, MGS2, etc.) don't require me to play them to appreciate them