Undertale Boss Battles Script -

def show_menu(): options = ["FIGHT", "ACT", "ITEM", "MERCY"] selected = 0 while not confirmed: draw_menu(options, selected) input = get_input() if input == "UP": selected -= 1 if input == "DOWN": selected += 1 if input == "CONFIRM": return options[selected]

START → PLAYER_TURN → ENEMY_TURN → PLAYER_DODGE → CHECK_VICTORY → END ↑_______________↓ (repeat)

His script is lighter, featuring comedic banter and "blue soul" mechanics explanations, often ending with him offering to be friends even if defeated. 2. Technical Boss Battle Scripts (Roblox & Modding) Undertale Boss Battles Script

A wave is a self-contained function that creates a specific bullet pattern. The code will instantiate bullet objects, define their movement trajectories (linear, sine wave, homing, etc.), and manage their removal when they leave the screen. A truly great boss fight will combine multiple bullet types in a single wave to create a complex, engaging challenge.

: GameMaker Studio 2 + YoYo Compiler for pixel-perfect recreation. Many Undertale mods (like Undertale Yellow ) use this. def show_menu(): options = ["FIGHT", "ACT", "ITEM", "MERCY"]

while battle_active: if state == "PLAYER_TURN": show_menu() action = get_player_action() if action == "FIGHT": damage = calculate_damage() reduce_enemy_hp(damage) state = "ENEMY_TURN" elif action == "ACT": run_act_script() state = "ENEMY_TURN" elif action == "MERCY": if spare_conditions_met(): state = "END_SPARE" else: show_text("... but you refused to spare.") state = "ENEMY_TURN" elif action == "ITEM": use_item() state = "ENEMY_TURN"

enemies = "my_boss" -- names of monster scripts enemypositions = 0, 0 -- sprite positions relative to centre (0,0) The code will instantiate bullet objects, define their

function EncounterName:init() super:init(self) self.music = "megalovania" -- The boss music self.background = true -- Use the default battle background self:addEnemy("sans", 500, 200) -- Where Sans stands end

PAPYRUS GREETS PLAYER - Text: "OH! YOU’RE IN MY LAIR!"

The open-source Godot engine has several projects ( and Godot-Undertale-Engine ) aiming to recreate the experience, usually coded in GDScript. UNDOTALE fully supports the core FIGHT, ACT, ITEM, and MERCY actions, as well as Red and Blue Souls, making it a promising base for future projects.