// In Papyrus attack step event if (soul_color == "blue") vspeed += gravity; if (place_meeting(x, y+1, ground)) vspeed = -jump_strength;
if global.kill_count >= 20 and global.area == "Last Corridor": sans.prepare_battle() sans.dialogue = "you've been busy, huh?" global.genocide_sans_trigger = True You don’t need to reverse-engineer Undertale’s original code. Here are the best modern tools: Undertale Boss Battles Script
elif player_action == "ITEM": use_item(inventory.selected_item) start_boss_attack(target.attack_pattern) // In Papyrus attack step event if (soul_color
# 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) Part 5: Mercy vs
: Use a coroutine or state machine to manage dialogue interlaced with attack patterns. Example: state = "attack" → state = "dialog" → display line → resume attack . Part 5: Mercy vs. Kill – Scripting Consequences The most impressive Undertale script feature is how boss battles remember your choices globally. You’ll need a persistent global.flags table.
if (act=="Share Cheese") ron.dialog = "MY CHEESE! ...Wait, for me?"; mercy += 5;