The film already has three genres: Adventure, Comedy and Science Fiction. Which one do you suggest we remove?

Adventure. Western should be a genre for this movie.

@banana_girl said:

The film already has three genres: Adventure, Comedy and Science Fiction. Which one do you suggest we remove?

Definitely remove adventure and replace with Western

I still really think Adventure should be replaced by Western

I agree with replacing Adventure with Western. Western is a more specific genre than Adventure, and it should be prioritized when it applies--which it absolutely does in this case.

Some quotes from Roger Ebert's review:

"Back to the Future Part III," [...] makes a few bows in the direction of time-travel complexities, and then settles down to be a routine Western comedy.

It's as if Robert Zemeckis, who directed, and Bob Gale, who wrote, ran out of time travel plot ideas, and settled into a standard Western universe.

The movie is so filled with old Western cliches that the regulars in the bar even include Pat Buttram.