If you want to convince someone into books that games can be art, go with something like Pentiment, Citizen Sleeper, or Disco Elysium.
If you want to convince someone into film that games can be art, go with Hellblade 2, Still Wakes the Deep, Immortality, As Dusk Falls.
If you want to convince someone that the interactivity can be classified as a new form of art, go with stuff like Tears of the Kingdom, Roblox, Minecraft, Dreams.
If you want to convince someone into music that games can be art, have them sit down and listen to a bit of Final Fantasy XIII, Starfield, Hi-Fi Rush.
If you want to convince someone into drawing that games can be art, show them RPG Time.
Trying to limit it to just 1 game is a little pointless when games are the fusion of almost every other type of art already out there, and you can showcase that from multiple different angles.