Movie franchise with the highest numbered sequel

The other day I was reading yet another article that mentioned 2015 as the “future” year that Marty McFly visits in BTTF2, and what we don’t have yet in the actual 2015. One of the things mentioned was that we haven’t made it to “Jaws 19” yet, which got me to wondering: what movie franchise has the highest numbered sequel? (As opposed to the highest number of sequels, which is not what I want.)

“Jaws” actually only had sequels numbered up to 3. (“3-D”, actually, but I’ll allow it.)

The “Nightmare on Elm Street” series made it to 5 before dropping the numbers.

“Friday the 13th” got up to VIII before it stopped numbering the sequels.

“Leonard Part 6” does not count, since it was not a sequel and there were no other films in the series.

Have any sequels had a double-digit number?

Except the tenth, though that’s Jason X.

A group of animated dinosaurs got up to XIII.

I think the filmmakers insisted that was “Ex” not “Ten” even though it was the tenth movie.

I think Friday the 13th Part VIII: Jason Takes Manhattan is the winner.

Naked Gun 33 1/3?

56 Up?

you never said the numbers had to be sequential.

This was the first thing I thought of. Since you beat me to it, how about 2010?

Do Superbowls count?

Star Trek got up to “Star Trek VI: The Undiscovered Country” before they dropped the numbers from the title.

Airport 79 ??

Halloween H20: 20 Years Later

Along with a lot of the other suggestions offered, that does not indicate the number of sequels.

How many 'Girls Gone Wild" have there been?

Oceans 13?

The OP specifically said they did not want the number of sequels made.

Please re-read the OP. He wants the highest title-numbered (one with the sequel number in the title), not the one with the actual highest number of sequels. This would mean that Land Before Time XII would count, while the 23rd James Bond movie Skyfall would not. Halloween H2O-Twenty Years Later indicates years, not sequel numbers.
edited to add: Otherwise, the OP would have just asked for the movie title with the highest number in it, and not have bothered indicating anything about sequels.

Heh. If we limited it to movies numbered sequentially, where the number in the title actually had to be the ordinal number of that movie in the franchise, I wouldn’t be surprised if a porn movie franchise was the “winner.”

Strange as it seems #39

Sleepy Eyes of Death 12

Witchcraft XIII: Blood of the Chosen (2006)

Shake Rattle and Roll Fourteen: The Invasion

Tsuribaka Nisshi 20: Final
(actually, it was the 22nd entry in the series, but two were unnumbered)

IF??? I thought that was exactly what OP was limiting it to.

Quite possibly, but the OP was ambiguous, and many of the answers given have not been adhering to that.

But it is a numbered sequel though. It just counts the years in the franchise rather than the number of movies.

Furious 7 (of Fast and the Furious) is about to hit the theaters.