Double Fine's internal game-jam process (Amnesia Fortnight) and its offspring of Costume Quest, Stacking, Once Upon a Monster, and Iron Brigade, are by now well known industry stories. What's less well known is why those prototypes were successfully signed and became full games while others we developed were not. Perfecting Pitchable Prototypes is about the specific lessons we learned while taking ideas from the prototype to the pitch, lessons about scope, focus, presentation, gameplay, and team dynamics that we found were the critical difference between an interesting idea and a fundable game.