Or a word game that I just thought up/have never heard about before. Which means it's probably ridden with bugs.
I say a word. You have to say a word that is one letter longer than my word, and has to have a first letter either one above or below the first letter of my word.
So that if I said Cat you'd be able to say Debt or Boat.
Then it'd continue off that word, and on until nobody can think of a word that fits. Z wraps around to A.