a few

Well of the ones we've covered so far there's the original novel series, the short story collection, the TV movie adaptation, the theatrical movie adaptation, the radio drama, the sequel to the theatrical movie adaptation that came out the same day as the theatrical movie adaptation, the other sequel to the theatrical movie that is unconnected to the first sequel, the dreamcast game, the wonderswan game, the surprisingly good tv show, the movie adaptation of the prequel story from the short story collection, the radio drama of that same short story, the manga adaptation of the theatrical movie, the manga adaptation of the 2nd sequel to the movie, the manga adaptation of the novel, the manga adaptation of the theatrical movie adaptation of the novel, the manga adaptation of the 2nd novel, the manga adaptation of the movie adaptation of the 2nd novel, the manga adaptation of the short story collection where they replace 2 of the 3 stories with new ones, the manga adaptation of the movie adaptation of one of the stories from the short story collection, the pachinko machines, the crossover with Ao Oni Online, the various amusement park rides, the taxi promotion, the promotional computer virus, and Tallest Sadako.

We haven't even gotten to the american movies yet