What a wild videogame “The Dream-Quest of Unknown Kadath” would make. The plot summary just says “game” all the way…
Dream three times.
Find and negotiate the seventy steps.
Get past the priests.
Get through the Enchanted Wood.
Encounter the Zoogs.
Travel to Ulthar
Talk to Atal
Travel to Dylath-Leen.
Negotiate the Black Galleys.
Battle the Moon Beasts
So far as I can discover, there’s not even a table-top RPG text adventure for the story, or even an interactive fiction. Which is kind of amazing.