There are a plenty of other adaptations inspired by this story and entire Cthulhu Mythos, like In the Mouth of Madness and Color Out of Space, but here you are not required to read the whole short stories collection. If you wish to, you can, of course, and please do share your thoughts! Personally I'd like to read more than one story, because I do have the whole collection but not so much time to invest on it whole, so some kind recommendations would be more than welcome! Also, if you are aware of some (good or bad) adaptations we should know about, freely share your expertise with us :)
There are a plenty of other adaptations inspired by this story and entire Cthulhu Mythos, like In the Mouth of Madness and Color Out of Space, but here you are not required to read the whole short stories collection. If you wish to, you can, of course, and please do share your thoughts! Personally I'd like to read more than one story, because I do have the whole collection but not so much time to invest on it whole, so some kind recommendations would be more than welcome! Also, if you are aware of some (good or bad) adaptations we should know about, freely share your expertise with us :)