# Simplified turn manager def battle_turn(player_action, target): if player_action == "FIGHT": damage = calculate_damage(player.attack, target.defense) target.hp -= damage if target.hp <= 0: end_battle(victory=True) else: start_boss_attack(target.attack_pattern) elif player_action == "ACT": act_command = selected_act(target) if act_command == "Check": show_text(target.check_info) elif act_command == "Flirt" and target.can_flirt: target.mercy_points += 20 start_boss_attack(target.attack_pattern)
# After sparing Toriel global.flags["toriel_spared"] = True global.flags["toriel_killed"] = False if global.flags["toriel_spared"] and global.flags["undyne_spared"]: asgore.dialogue = "You remind me of someone I loved." asgore.attack_power -= 2 Undertale Boss Battles Script
By mastering the , you’re not just coding. You’re becoming a storyteller. So open your favorite engine, start with a simple if (player.hp <= 0) game_over() , and build outward. Test your patterns, fine-tune your mercy thresholds, and remember: in this world, it’s script or be scripted. Test your patterns, fine-tune your mercy thresholds, and
function ron_attack() switch(phase) case 0: spawn_projectiles("cheese_wheel", 6); break; case 1: spawn_projectiles("tail_whip", 3); break; Part 7: Step-by-Step – Writing Your First Boss
: GameMaker Studio 2 + YoYo Compiler for pixel-perfect recreation. Many Undertale mods (like Undertale Yellow ) use this. Part 7: Step-by-Step – Writing Your First Boss Script Let’s walk through building a mini-boss script: “Ron the Remorseful Rat.” Step 1: Define the boss object // Create event hp = 45 mercy = 0 mercy_needed = 15 phase = 0 soul_color = "red" Step 2: Turn script // Step event - player turn if (turn_over) show_menu(); turn_over = false;
But for modders, fan-game developers, and curious programmers, the question isn't how to beat these battles, but how to script them . What makes a Sans attack pattern tick? How does Toriel’s mercy flag trigger? How can you replicate the infamous "dying soul" slow pan in GameMaker: Studio, Construct, or Unity?
elif player_action == "ITEM": use_item(inventory.selected_item) start_boss_attack(target.attack_pattern)