Yo, gamer! Ready to explore Undertale, the RPG that’s got everyone hooked with its wild characters and gut-punch story? Whether you’re new to the Underground or chasing every last secret, this Undertale Complete Game Guide is your ticket to success. We’ll cover all the routes (Pacifist, Neutral, Genocide), toss in boss fight hacks, and reveal hidden goodies. No big words, just straight-up tips to help you rule the game. Let’s dive in!
Table of Contents
Getting the Hang of Undertale’s Mechanics
Before you hit the Underground, let’s nail the basics. Undertale is all about your choices, and knowing how it works makes everything click.
Choose Your Path: Spare or Fight
Every monster you meet gives you two options: fight or spare. Fighting’s simple (just attack till they’re gone). Sparing takes more work. You use ACT moves (like joking or cheering) to make monsters friendly, then spare them. Your choice shapes the game:
- Spare all: You get happy, peaceful vibes.
- Fight some: The story twists and gets tricky.
Pick what suits you, and we’ll show you how to ace any path.
What’s EXP and LV All About?
You’ll notice EXP (Execution Points) and LV (Level of Violence) in fights. These track your actions:
- EXP: You get it from defeating monsters. No EXP means you’re keeping things friendly.
- LV: Goes up with EXP, boosting your strength but changing the story.
Staying at LV 1 is a must for Pacifist, while piling up LV is the Genocide way. Watch these to steer your adventure.
The Three Routes Explained
Undertale has three big routes, each with its own feel. Check this table for a quick peek:
| Route | What’s the Deal? | Playtime | Who’s It For? |
| Pacifist | Spare everyone, make buddies, happiest ending. | 6–8 hours | Newbies, story fans. |
| Neutral | Mix sparing and fighting, tons of endings. | 5–7 hours | Players testing the waters. |
| Genocide | Defeat all monsters, dark and super hard. | 6–10 hours | Pros wanting a brutal challenge. |
Pacifist Route: Spread the Love
This route is all about kindness and making friends with every monster in the Underground. You focus on sparing everyone, keeping your EXP at zero by never defeating anyone. To make it work, use ACT options to find what makes each monster happy, like joking or cheering them up. It takes a bit longer than other paths, but it rewards you with the True Pacifist Ending, a heartwarming conclusion full of hope. This is the perfect choice for your first playthrough to experience Undertale’s emotional story at its fullest.
Neutral Route: Play It Your Way
Can’t decide between sparing or fighting? Neutral lets you mix it up. Your choices decide the ending, so it’s super flexible. It’s a solid pick for trying stuff out, but it might leave you wanting more of the story.
Genocide Route: Go All Out
Heads-up: this one’s heavy. You defeat every monster in every area, grinding till nothing’s left. It’s tough, with crazy boss fights and a dark tone. Save it for later runs, as it can mess with other endings if you’re not ready.
Step-by-Step Area Walkthrough
Let’s tour the Underground, area by area. Each spot’s got puzzles, monsters, and choices that shape your route. We’ll keep spoilers low but give you enough to stay on track.
Ruins: Kicking Things Off
The game starts in the Ruins, a cozy spot with a friendly vibe. You meet a talky flower and a sweet goat-like guide.
- Puzzles: Flip switches and step on patterns. Chat with NPCs for clues.
- Monsters: Easy to spare. Try ACT moves like “Sing” or “Compliment.”
- Tips: Pick up the Toy Knife for attack (if you’re not Pacifist). Save gold for later.
Pacifist Tip: Spare everything, even that flower. Genocide Tip: Fight till monsters vanish.
Snowdin: Cool Vibes and Puzzles
Snowdin’s a snowy town with fun puzzles and skeleton brothers who steal the spotlight.
- Puzzles: Slide tiles and find hidden switches. Read signs for hints.
- Monsters: Dogs and snow critters. Use ACT like “Pet” or “Laugh” to spare.
- Tips: Grab the Manly Bandanna for defense. Heal at the inn if you’re low.
Pacifist Tip: Take your time with the skeletons (they’re awesome). Genocide Tip: Clear every fight before moving forward.
Waterfall: Deep and Dreamy
Waterfall’s got glowing caves and a spooky feel. The story hits hard here.
- Puzzles: Cross bridges and dodge flowers. Stay sharp for stealth parts.
- Monsters: Trickier foes like jellyfish. ACT options vary, so experiment.
- Tips: Buy Sea Tea for speed. Save at glowing spots.
Pacifist Tip: Look for NPC chats to deepen the story. Genocide Tip: Grind battles room by room.
Hotland: Turn Up the Heat
Hotland’s a hot maze with lasers and quirky shows. It’s wild but fun.
- Puzzles: Dodge lasers and jump vents. Time your moves right.
- Monsters: Robots and guards. Try ACT like “Pose” or “Cool Off.”
- Tips: Get the Burnt Pan to boost healing. Save gold for shortcuts.
Pacifist Tip: Keep being friendly, even to loud foes. Genocide Tip: Battles get tougher, so stay focused.
CORE and Endgame: Big Moments
The final stretch is a techy maze leading to huge choices.
- Puzzles: Random paths and switches. Explore to find your way.
- Monsters: Elite foes. Sparing takes effort, but fighting’s fast.
- Tips: Equip Cloudy Glasses or Torn Notebook for defense.
Pacifist Tip: You’re near the big ending, so keep sparing. Genocide Tip: Brace for the toughest fights.
Winning Boss Fights
Bosses are Undertale’s core. Each one’s like a puzzle, whether you’re sparing or fighting. Here’s how to handle them.
Pacifist and Neutral Boss Tips
| Boss | Area | Spare Strategy | Fight Strategy |
| First Boss | Ruins | Use ACT to calm them, then spare. | Hit steady, dodge simple attacks. |
| Skeleton Bro | Snowdin | Survive attacks, try fun ACT moves. | Dodge bone patterns, strike fast. |
| Spear Fighter | Waterfall | Match their vibe with ACT, keep cool. | Watch spear waves, attack quick. |
| TV Star | Hotland | Get dramatic with ACT to charm them. | Avoid bombs, keep hitting. |
| Final Neutral | CORE | Long fight, mix ACT and patience. | Dodge heavy hits, attack when safe. |
Tip: Stock Cinnamon Buns for healing in rough fights.
Genocide Bosses: No Joke
These fights are next-level hard, with wild patterns.
- Snowdin Boss: Fast bone combos. Dodge tight spots and hit hard.
- Waterfall Boss: Spears all over. Learn the pattern or you’re toast.
- Hotland Boss: Explosive chaos. Stay moving and strike when clear.
- Final Genocide: Super tough. Grab Legendary Heroes (sandwiches) and practice.
Tip: Save before each boss. You’ll need all your HP.
How to Unlock Every Ending
Want to see every ending? Here’s the plan to make it happen.
True Pacifist Ending Guide
This is the best ending, full of feels.
- Finish a Neutral run without defeating anyone (LV 1, no EXP).
- Reload and hang out with key characters (chat, visit them).
- Go to the final area for new events.
- Spare everyone in the big finish.
Tip: Don’t miss side talks (they unlock the magic).
Neutral Ending Mix-Ups
Neutral endings change based on your choices. For example:
- Spare most but defeat a big boss? You get a mixed ending.
- Defeat only small monsters? The story shifts a bit.
Replay and try different combos to see them all.
Genocide Ending Breakdown
This one’s dark and sticks with you.
- Defeat every monster in each area till battles stop.
- Check your save for a “nobody came” hint.
- Face unique, crazy-hard bosses.
- Finish it, but it tweaks future runs.
Tip: Save a backup if you want to try other routes later.
Hidden Gems and Cool Secrets
Undertale’s bursting with surprises. Here’s a few to hunt.
Rare Items and Sneaky NPCs
- Dog Residue: In Snowdin. Sell for gold or keep for fun.
- Mystery Key: Opens a secret spot (check Hotland shops).
- Special NPCs: Find shy characters in Waterfall or Hotland for cool chats.
Tip: Talk to everyone (some lines are super rare).
Extras for Total Completion
For 100% fun, try these:
- Spot the Annoying Dog hiding around.
- Unlock Hard Mode with a special character name (hint: think game creator).
- Use your phone everywhere (some calls are pure gold).
Smart Inventory and Combat Tricks
Your inventory and fight skills can save your run. Here’s how to shine.
Must-Have Items
| Item | Where to Find | Why You Want It |
| Butterscotch Pie | Ruins | Full heal for tough spots. |
| Sea Tea | Waterfall | Speed boost to dodge better. |
| Legendary Hero | Hotland | Big heal plus attack power. |
| Burnt Pan | Hotland | Makes food heal more (Pacifist pick). |
Tip: Save pies for bosses, use cheap stuff like Monster Candy for quick heals.
Dodging Like a Pro
Fights are like bullet-dodge mini-games with your heart in a box.
- Learn Patterns: Attacks repeat, so watch closely.
- Keep Cool: Don’t panic (it makes you mess up).
- Practice: Hard bosses take tries. No shame in that.
Tip: Move your heart in tiny circles to slip through gaps.
Wrapping Up: Why Undertale Rules
Undertale is more than a game (it’s an experience). Whether you’re sparing every monster, mixing choices in Neutral, or tackling Genocide, every run’s got its own magic. This Undertale Complete Game Guide is here to help you explore every puzzle, fight, and secret in the Underground. Grab your gear, stock up on snacks, and jump in. The Underground’s calling, and you’re ready to rock it!
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