Once Upon a Time is a collaborative storytelling card game where players craft a shared fairy tale using elements such as dungeons, giants, and cauldrons from their hands. Each player aims to guide the narrative toward their own secret ending while incorporating story cards into the tale. The objective is to play all story cards and successfully reach the predetermined conclusion. Suitable for players of all ages, the game encourages creativity and improvisation within a structured framework. The outcome may or may not result in a happily ever after.