Using the API, I have compiled a list of franchises that are listed as having only one game or no games at all. This is the first of many reports I'll be generating on a semi-regular basis for Giant Bomb and Comic Vine. I'll release the code for these reports when I'm reasonably confident that it can safely be used by others without causing world destruction.
 
Please take a look a look at the list and see if you can help out. Some simply need to have the appropriate games added, but some will need to be deleted. 
 

Franchises with one game

Franchises with no games

That's really weird that Tetris: The Grand Master comes up because I know for a fact that there were at least three arcade installments with that name that came out way before the 360 game. Looks like I might be having a little wiki homework on my hands....

Based on some quick research, A Nightmare on Elm Street only has one game in the franchise.
 
Edit: Same with NBA Hangtime and The Great Battle.

Get the men upstairs working on the franchise technology!

"Pop" and "N" are a bit problematic because you can't add some of the games to the franchise since they have "+" in the title. 
 
It's a bit odd that "Aha I got it" popped up as a one game franchise since there are 2 games in there.

I edited the "Aha! I Got It" page yesterday to add a second game