This game adopts a bullet attack method. When dodging, pay attention during the enemy's turn, and control the soul to dodge bullets in the "Bullet Board". Different enemies will fire bullets in different patterns. This article provides a comprehensive guide to Deltarune, defeating all enemies to win through reasonable strategies and operations. After winning a battle, players can gain experience points, money, and other rewards to enhance their character's abilities.

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I. Chapter One
(I) Main Story, Awakening in the Dark World
1. Falling into the Dark World
Initial Area: Proceed along the only path, ignoring all interactive swollen entities (to save time).

Evil Swinging Entity: Keep your distance, and after it fires three bullets, attack its core from the right side.
2. Castle Town and Prophecy
Ralsei Joins: Watch the prophecy cutscene, and choose "Listen to the Prophecy" to unlock the key item "Lightener's Handbook."

First Battle with Lancer: Prioritize destroying his Spade Shield, as attacks are ineffective when he is in a defensive stance.
3. Plain Chase and Team Reorganization
Death Maze: Follow the right wall straight, skipping all Jigsawry battles (except for Top Chef on the mandatory path).
Susie Leaves Event: Choose the "Wait for Susie" option, or you will miss the "S-Action" tutorial.
4. Final Battle on the Big Chessboard
C.Round/K.Round Battle:
Phase 1: Focus on dodging the laser sweep, using the chessboard squares for positioning.
Phase 2: When K.Round transforms, Ralsei uses "Lightener's Guidance" to mark its weak point (head core).

5. Final Battle in the Card Castle
King Battle:
Phase 1: Spread out to avoid overlapping AOE attacks.
Phase 2: When King summons Lancer, Susie uses "Ultimate Roar" to interrupt their combination skill.

(II) Side Quests and Hidden Elements
Hidden Room: Starwalker Bird
Entry probability is 1/50, obtaining the "Mysterious Egg" (key item for Chapter 3), and cannot re-enter after leaving.

Broken Key Collection
A Key: Purchase from Seam's Shop (requires completing the "Chocolate Diamond" quest).
C Key: Obtain from a puzzle chest (requires Rouxls Kaard's "Control Crown").
Character-Specific Quests
Susie: Complete the "Violent Axeman" challenge to unlock "Berserk Mode" (attack power increases by 50%, lasts for 10 seconds).
Ralsei: Bake a "Yarn Ball Cake" at the bakery to trigger the "Darkener Fusion" plot.
(III) Multiple Endings Trigger Conditions
Normal Ending: Complete all main quests, seal the dark fountain, and Kris and Susie return to their daily lives.
Hidden Ending:
Collect all "Mysterious Eggs" (total 2).
Choose "Defy the Prophecy" in the final battle to trigger the "Choice of Light and Darkness" plot.
Ending Animation: Kris's soul fuses with the "Knight" will, causing a branching timeline.
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II. Chapter Two Cyber World
(I) Full Analysis of the Main Storyline
1. Entrance to the Cyber World
Queen Appears: Watch the "Arcade Trap" cutscene, and choose "Refuse the Agreement" to avoid being controlled.
Noelle Captured: Follow the right path, using the "Glowing Fragment" speed buff to quickly reach the mansion.

2. Mansion Exploration
Glass Path Puzzle: Light up the eyes in the order of "Red → Blue → Green → Yellow" to unlock the hidden passage.

3. Spamton Battle: Use the chessboard squares to dodge bullets, and Ralsei continuously heals.
4. Ice Tomb Route
Berdly's Death: Choose "Freeze All Enemies" to trigger Noelle's darkening plot.
Kris's Choice: At the final fountain, choose "Seal" or "Liberate," affecting the initial state of Chapter 3.
(II) Side Quests and Hidden Elements
Hidden Area: Bakery
Complete the "Malius Smithy" quest to obtain the "Anti-Interference Headphones" (immune to Queen's electromagnetic attacks).
Talk to Hathy three times to unlock the "Heart Donut" recipe (restores 100% HP for the entire team).
Character-Specific Quests
Noelle: Complete the "Frozen Blast" challenge to unlock "Absolute Zero" mode (freezes all enemies for 5 seconds).
Lancer: Collect 5 "Lancer Stickers" to trigger the "Fan Club" hidden plot.
(III) Multiple Endings Trigger Conditions
Normal Ending: Seal the Cyber Plain Fountain, Queen joins Castle Town, and Kris and Susie return to school.
Hidden Ending:
Collect all "Lancer Stickers" (total 10).
Choose "Liberate the Fountain" in the final battle to trigger the "Cyberpunk Revolution" plot.
Ending Animation: Queen fuses with the Darkeners of the Cyber World, establishing the "Mechanical Kingdom."
III. In-Depth Development and Battle Strategies for All Characters
1. Kris Dreemurr
Core Position: Versatile warrior, can switch between sword/shield and combat forms.
Hidden Abilities:
Entering "Independent Will" mode after pulling out the soul, attack power increases by 30%, but cannot be controlled by the player.
Collecting "Mysterious Eggs" unlocks the "Soul Resonance" skill (increases critical hit rate for the entire team by 20%).
2. Susie
Core Position: High burst damage, exclusive "S-Action" system.
Hidden Abilities:
In "Berserk Mode," attacks inflict bleeding (loses 2% HP per second).
When paired with Noelle, triggers the "Monster Sisters" bond skill (increases group attack by 15%).
3. Ralsei
Core Position: Support healer, key puzzle solver.
Hidden Abilities:
After baking a "Yarn Ball Cake," unlocks the "Darkener Fusion" skill (increases defense for the entire team by 25%).
Collecting "Lightener's Handbook" fragments unlocks the "Ultimate Healing" mode (instantly restores full HP for the entire team).
4. Noelle
Core Position: Control mage, expert in ice magic.
Hidden Abilities:
In "Absolute Zero" mode, enemy movement delay is 50%.
When paired with Berdly, triggers the "Nerd and Coward" bond skill (SP recovery speed increases by 50%).
IV. Quick Guide to Solving All Puzzles
1. Classic Puzzle Recap
Eye Puzzle
Order: Left → Right → Center, resets after 10 seconds if failed.
Hidden Solution: Press all buttons simultaneously to trigger "Lightener's Resonance" and complete directly.
Clock Puzzle
Order: 12:00 → 3:00 → 6:00 → 9:00, wait 2 seconds after each adjustment.

Hidden Solution: Enter the "DELTA" code to directly unlock the passage.
2. Cyber World Puzzles
Keyboard Puzzle
Enter "AGREE2ALL" and then choose "Oppose the Agreement" to avoid being controlled.
Hidden Solution: Enter the "FREEDOM" code to unlock "Rebel" mode (attack power increases by 10%).
Car Puzzle
Spell "December" by quickly clicking letters without needing precise order.
Hidden Solution: Enter the "JEVIL" code to directly summon a hidden character for assistance.
V. Boss Battle Strategies and Weaknesses
(I) Chapter One Boss Battles
Lancer
Weakness: Spade Shield, enters a weakened state after destruction.
Hidden Phase: Summons "Mini Lancer" clones when HP is below 30%.
King
Weakness: Crown on the head, be cautious of AOE skills while attacking.
Hidden Phase: Summons "Darkener Guards" when HP is below 50%.
(II) Chapter Two Boss Battles
K.Round
Weakness: Core on the head, use chessboard squares for positioning while attacking.
Hidden Phase: During transformation, unleashes a full-screen attack that cannot be dodged, requiring "Lightener's Guidance" to mark the weakness.
Spamton
Weakness: Core Processor (located in the chest), be cautious of laser sweeps while attacking.
Hidden Phase: Triggers a self-destruct countdown when HP is below 20%, must be destroyed quickly.
GIGA Queen
Final BOSS, when her health bar is nearly depleted, she releases a giant baseball. Hit the baseball back to win.

VI. Complete Collection and Achievement Guide
(I) Key Item Collection
Mysterious Egg (temporarily 2 in total)
Chapter One: Obtained in the hidden room Starwalker Bird.
Chapter Two: Dropped by Queen after defeating Spamton NEO.
Chapter Three (speculated): Obtained after completing the "Choice of Light and Darkness" plot.
Broken Keys (A/B/C keys)
A Key: Purchased from Seam's Shop (requires completing the "Chocolate Diamond" quest).
B Key: Reward from Lancer's "Fan Club" hidden plot.
C Key: Obtained from a puzzle chest (requires Rouxls Kaard's "Control Crown").
(II) Hidden Achievement Unlocks
"Silent Lamb"
Condition: Do not talk to any NPCs throughout Chapter One.
Reward: Increases the duration of Kris's "Independent Will" mode by 5 seconds.
"Violence Aesthetics"
Condition: Complete all battles in Chapter Two using only Susie.
Reward: Reduces the cooldown of Susie's "Berserk Mode" by 30%.
"Peacekeeper"
Condition: Complete Chapter One without killing any Darkeners.
Reward: Reduces the SP consumption of Ralsei's "Ultimate Healing" mode by 50%.
VII. Ultimate Speedrun Techniques
1. Time Management
Save and exit to the title screen immediately after advancing the story each day, then reload to skip some cutscenes.
Use the "Fast Travel" feature to avoid repeated map traversal.
2. Hidden Shortcuts
Chapter One: Break the wall with iron shackles in the prison area to reach the 1F elevator directly.
Chapter Two: Use the "Glowing Fragment" speed buff in the Cyber Plain to cross the plain within 5 minutes.
3. Character Synergy
Keep Kris and Susie in sync for attacks to increase the chance of "Combo Critical Hits" by 50%.
Alternate healing with Ralsei and Noelle to boost the team's sustained combat capability by 300%.
In summary, collecting all "Mysterious Eggs" and choosing "Defy the Prophecy" in the final battle may trigger subsequent hidden plots, and Kris's soul anomaly might be resolved after completing the "Choice of Light and Darkness" plot and unlocking the "Soul Resonance" skill. The comprehensive guide to Deltarune has been completed. Next, we look forward to you experiencing the full story of Deltarune, unlocking all hidden elements and multiple endings, and becoming a true "Hero of the Lighteners"!