# Run the battle flowey_battle(player)
For developers, modders, and fan-game creators, replicating that magic starts with one critical search term: .
Below is a minimal encounter script skeleton to get you started: Undertale Boss Battles Script
What must the player do to turn the name yellow?
If the player chooses to fight, the game delivers a gut-punch. A single, accidental critical hit reduces Toriel to ash in seconds. The game stops. The music cuts. The realization hits: I didn't have to do that. A single, accidental critical hit reduces Toriel to
Interestingly, the game itself has scripts that interact with the player's memory. For the fight, there is a "rating" script that calculates scores based on how many attacks you dodge and how well you perform. This script then changes the dialogue dramatically at the end of the fight.
[Battle begins]
Every Undertale fangame starts with the UI script. Here’s a pseudocode breakdown of the battle menu logic (suitable for GameMaker Language or Python/Pygame):