A condition in game programming that causes a variable to change. Event Flags are set off when certain events take place -- Boss Battles, Cutscenes, leveling up, One Ups -- anything that's important to the plot or to your stats. Flags can also trigger anything, from changing a character's status to activating subquests or side-plots to adjusting what sort of Random Encounters show up. Generally, a Broken Bridge is "repaired" by an event flag, and an unsolvable puzzle gets its solution from it as well.