Level 25-36

By now you would be able to go to Underfell. If you need help with the Underfell Bosses click here.
If you need help with Undertale Realm Bosses click here.

Anyways a few things to remember:

1. Start grinding Asriel until you are level 30, and then start grinding Underfell bosses WITH OTHER PLAYERS THAT CAN GO TO UNDERFELL.
2. Save up G until you are level 36: Aim to acquire at least 270 000 G
3. Finally, by now you should really aim to have the Error Blaster (Drop from Error!Sans) by the time you are level 36. If anyone gets Error, get 6 Steaks and join. If you get Error and don't have food, get others, hopefully those with the Error Blaster to take the distracting and dodge.

Oh, yeah, you should also have Chara's Knife by now, if you don't then grab the G and buy it.

And all the Underfell bosses are listed below.

• Underfell Toriel Lv 25+ (From spawn, head to the Ruins and go left at fork. Keep going straight, the Training Hall and Spider Bake Sale are to the right if you need them, and round the corner and go left when it forces you to)
• Underfell Papyrus and his Pathetic Brother aka Underfell Sans Lv 27+ (Take the shortcut at the spawn to Snowdin Town, and keep going straight. Papyrus is at the end.)
• Underfell Muffet Lv 30+ (From spawn head to Spiderlands. Uf Muffet is at the end)
• Underfell Undyne Lv 32+ (From spawn head to Waterfall. Go until the red glowing area and heal left)
• Underfell Asgore Lv 36+ (From spawn, head to Hotlands and go left but at the end you will find Judgement Hall keep going till the end you will see him in Throne Room)

So there is one Training Hall in the  Ruins, same place as before, but this time there are 3 Froggits: 2 Hard ones that have 100 Hp and a Final Froggit at the end with 200 Hp. There is also a secret. Walk into the wall at the back and you will be able to fight Jerry. Behind him there is a small Jerry that has more Hp. Normal Jerry stats: 500 Hp contact damage only way of offense and drops Glamburger. Small Jerry Stats: 800 Hp only contact damage and drops Hamburger.

So that is about it, give feedback in comments and go to the links at the top if you need help!

Undertale Boss Battles Strategies

We will start with a list of the bosses this guide will post:

• Toriel
• Papyrus
• Muffet
• Mettaton
• Asgore
• Undyne
• Sans
• Photoshop Flowey
• Asriel Dreemur Phase 1
• Chara
• W.D Gaster
• Error!Sans

Toriel, Papyrus, Asgore, and Undyne

Slowly inch away, activating shift lock, as you attack. Papyrus and Undyne will require you to make lots backward movement because of Bone Zones and Ground Spears. Asgore will need faster reflexes because of the fast Fire Circles attack. Undyne has 50 Hp at the start, but once you bring her down to 30, she transforms into Undyne the Undying, who has 200 HP. Asgore as 200 Hp as well. Toriel and Papyrus both have 120 Hp. Toriel drops 400 Exp and 250-400 G, Papyrus drops 500 Exp and 250-500 G, and Asgore drops 1500 Exp and 800-1500 G. Finally Undyne drops 4000 Exp and 3000-10000 G.

Muffet

Muffet has 120 Hp. There are webs around the arena that slow your running speed a lot, and she summons spiders to damage you. Use the inch away tactic WHILE AVOIDING THE WEBS (important detail ). She drops 600 Exp and 400-600 G.

Mettaton EX

This is a Dance Dance Revolution mini-game where you have to press the arrow keys as they enter the arrows at the top. Like the original fight in Undertale, flip the switch on his back first. Eating the food and getting arrow keys right gives you ratings. Food that gives you ratings is mostly food from the Tem Shop, mainly Starfait, Legendary Heroes, and Face Steaks. You need to get to 9000-11000 ratings to win.

Sans

Once again, Sans is ridiculously hard considering his stats, though this time he does more actual physical damage, and does a lot of poison KR. He has 3 phases.

Phase 1: His flame eye will start getting bigger. First no fire, then fire on is eye, then his head on fire, then finally his entire body is on fire. You have to wait him out. Attacking makes the battle harder, but also quicker. so don't attack unless you are really good at dodging. He will immediately do a huge burst of attacks, then calms down, doing one attack at a time, using very weak kinetic energy to sorta move you around... barely. But it gets stronger as the battle goes, and then it can be a dangerous ability. I recommend bringing 6 Steaks, you must eat your candy first, to heal. One Steak heals 160 Hp. If the Snowman is in Snowdin, grab some Snowman Pieces too. Each one heals 200 Hp. Also bring lots of help: 4 or 5 people, including you, is ideal, but if you are good at dodging, you might be fine with less.

Eventually the whole Judgement Hall is flipped, which starts the second phase.

The second phase is the hardest. Remember that burst of attacks Sans threw at the beginning? Well, this phase is that non-stop. The ceiling is now the floor, and Sans' kinetic energy is very strong and can fling you into attacks. As soon as you can move after the kinetic, RUN TO THE OPPOSITE SIDE OF THE ROOM. Chances are, then, that you won't get hit. Take turns distracting him with your allies, and and rest of people should stay on the opposite side of the room, far away from Sans. People with the Scythe help, because Sans' kinetic powers won't work on people HOLDING THE SCYTHE. You have to actually be able to attack with it, otherwise you will still be flinged to other parts of the room. After a bit, Sans will make the window wall the floor, so the pillars restrict your movement. For the wall floor, get near Sans. Sound strange? Well, after he is right next to you, jump on top of him. From there, get on top of a pillar.

Everyone should do this. Then you can jump in circles on top of the pillars! Sans' telekinesis can get you off the pillars, but you can simply jump on him, then jump onto the pillars again. Soon the door will be the floor. For this, try and just avoid the attacks. This part is only like 1 minute so you should be okay.

Sans will then send you down another skyscraper drop onto the other door. Same strategy.

Now the ceiling floor starts again; use the same strategy as before.

Finally, the last phase begins when Sans turns the Last Corridor normal again. Now his attacks will get weaker as he tires out. At the end, his flame eye is gone, he barely attacks, he can't really teleport, and you can attack to kill him. Hope you made it. He drops 10 000 Exp and 6000-12000 G, so he is good for farming if you are one of those lucky few who have mastered dodging.

Photoshop Flowey

This is honestly really difficult fight, it should have a higher level requirement. But anyways, you need to be at least level 5 to fight him. So, in phase 1, you have to step on the six human souls as they appear throughout the battle. Do not attack he has 4000 HP but after you step on the 6 human souls the fight button will start appearing. Stepping on it does 50-400 damage to Flowey. So smash away!

As for dodging his insane attacks, stand behind him for the flytrap, and the friendliness pellets you jump. The vines can easily be avoided by running around, which you have to do anyways to tactically avoid his other attacks. He drops 4000 Exp and 3000-5000 G.

Asriel Dreemur

Honestly way easier than the above. You need to be Level 10+ to fight him. Get help, and he uses a giant rainbow gaster blaster for some reason, just avoid those, and the whole time, stars are falling from the sky. He also uses Lightning, just use the same strategy during Flowey's vine attacks: Don't stay still. For the Stars, you don't have to worry since they will probably not hit you. Asriel also uses an attack called Mini Goner ( Hyper Goner is used by Final Asriel ) and it is pretty hard to avoid. Just use the Scythe if you have it, but since most players don't, you should just run and hope you don't get hit. He has 300 Hp, and you should have some people to help you. Asriel drops a cool 7000 Exp and 3000-6000 G.

Chara

10000 Exp and 15000-20000 G
Arguably harder than Asriel, Chara is well... I'll be honest, REALLY HARD. Chara is only fought by being level 20+ and beating Sans. One of the worst things is that Sans and Chara are back-to-back battles, and unless you are really good you already lost 2-4 Steaks from your battle against Sans. Chara has a big 350 Hp, which is pretty big if you are only level 20-30. Bring as much help as you can, at least 4 people with you. Hopefully you have at least 3 or 4 Steaks left. Most of her attacks are copies of Undyne's but with knives instead of spears, which is really hard to see because of the small size of the knives. She also uses more attacks at once as her Hp gets lower, similar to Sans. She has one unique attack though: A red circle will sometimes appear around Chara, and within a few seconds it can become the most dangerous place in the arena. Soon a giant tower thing will erupt from the circle, instantly killing anyone caught in it's deadly AOE. That's like all the advice I have, since I haven't beaten her myself, so good luck.

W.D. Gaster

15000 Exp and 30000 G
This is it: The time to battle the former Royal Scientist. This is a really hard fight so bring help and food. If you wish to go through the grey door, read on. If not, skip to the next PaRAgrApH.

Finding Gaster

To find Gaster, go to the Lab. Then go upstairs and click on the picture of Mettaton. A noise should play. Now go to the black door downstairs. Click on it. You should be teleported to...

The True lab
So, now go to all the entries. click on them so they say connecting. Ignore the one that says "Offline" for now though. Once they are all on (Ignore Endogney, not worth the fight), turn on the one that says offline. You should be teleported to a black room. Look around. You will see a grey door.

So wait for your other friends to come. Once everyone is here and has 6 Steaks, go through the grey door. Everyone goes through the grey door.

The Fight
You will be in a dark room with Gaster in front of you. Gaster's Hp bar says ??? but he is estimated to have around 200-350 Hp. He mainly uses Gaster Blasters that increase in number the less Hp he has, from 2 Gasters forming a cross to 8 Gasters aimed at the middle. He has to dangerous attacks though: the Void Pull which sends out a huge black circle around him that expands then retracts back towards him. If you get caught in it you will be dragged to Gaster and take huge amounts of damage, and, probably killed. On the other hand, Gaster can send out three shadows that home in on you and you take damage if you get hit. BUT if you get hit, Gaster also gets healed. If all three find their mark it heals him almost to full Hp. He can use telekinesis not unlike Sans, and uses the ability to make players slower but also let them jump higher.

One last thing to note: there are rumors that eating food heals Gaster as well. THIS IS NOT TRUE, IT IS PERFECTLY FINE TO EAT FOOD, ONLY THE SHADOW ATTACK HEALS GASTER. So bring 6 Steaks and chomp some Mettaton-shaped meat whenever you need Hp.

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Error!Sans

10000 Exp and 10000 G
To fight this elusive boss, you just have to wait. Error kidnaps a random player every 40 minutes. If you get it, tell the whole server. You will end up in a black room with a creepy message on one wall and the teleportation thingy on the other wall. Wait until everyone is ready, then step on the teleport.

If someone else gets it, they will probably tell the whole server about it. Tell them to wait, then go to the Tem Shop and get 6 Steaks. Immediately. After, tell them to invite. Accept.

The Fight

This is basically Sans but with a few twists. First, Error's most annoying ability is the ability to string people to the floor or the ceiling, and sometimes somewhere in between. If you get stringed, he will target you and no one else until you get off the strings. If you get stringed, KEEP MOVING.

Secondly, he can use a giant Error Blaster that instantly kills anyone caught in it's blast. Just avoid it.

Error can use telekinesis, Bone Zones, and Bone Circles, like Sans, but instead of flipping the Judgement Hall, he turns the soul colors of everyone different colors. First phase is normal, then he turns your soul blue, decreasing jump height, then the final phase he turns your soul grey, which makes you jump higher but makes your movement slower.

As for strategy, just use the techniques for normal Sans plus the ways to dodge Error's new attacks here. Once you win, you earn a huge sum of G and Exp as well as the Error Blaster, which is your first ranged weapon. It lets you create your own Error Blasters. Each laser does 1 damage.

So yeah, I guess that is it for this page, please let me know in the comments if something is wrong.

Levels 10-25

Welcome back to my  Undertale 3D Boss Battles Guide.

During the long gap to level 25, you really don't have anything to do except to grind to level 25 so you can start Underfell.

The best bosses to grind are Undyne, Asriel, and Sans too if you are really good. Get help since these are extremely tough bosses to take on yourself. Once again, click on this link for boss strategies in the Undertale Realm.

By now, you should have the Frying Pan. If not, farm Froggits in the Training Hall until you have
10 000 G, then buy it at the Tem shop.

While you are grinding, you will be getting lots of G at a surprisingly fast rate. Save this G up for Chara's Knife, which you should aim to get by the time you are level 25.

Also, do not get the Worn Dagger. It does barely more damage then the Frying Pan so it is a waste of G unless you want to 100% the game.

I recommend farming Undyne until you are level 21, then farm Asriel until you are level 30. Sans is probably to hard for you at this point, so stick to Undyne and Asriel for now, and always invite.

And yes, that's probably it for levels 10-25. Levels 25-36 and boss strategies coming soon!

Levels 1-10

Welcome to my Undertale 3D Boss Battles Guide! During your first few levels playing, you will probably, slowly, get the sense of what to do, the basics, and so on. Here are a few tips and if you need help with bosses, check out the Undertale boss battles strategies page I made to help.

1.  This can be a very difficult game if you're a beginner, so visit lots of wikis and guides to help you ( But beware of spoilers if you don't want them! ).
2. By the way, THERE IS NO PACIFIST ROUTE SO DON'T TRY.
3. If you get Error!Sans ( Go check that link at the top if you want to learn more about him and how to get to him... Or more like he gets to you ) tell the whole server. He is somewhat rare and elusive to fight so people will yelling at you to invite or wait for them to get food. Wait until everyone is ready, then go in and invite them all and watch just how many people come.
4. Finally, whenever you leave, REMEMBER TO SAVE. Be sure to SAVE if you don't, when you come back, you will not appreciate what it does.

Anyways, the first thing you should do is get a better weapon. Go to the Training Hall ( In the Ruins keep looking around and you will see it there is also a toriel selling B Pie Fulls for 10 tem tokens each ( You get tem tokens via robux ). Each B Pie fully restores all your HP and they have 4 uses each. There is also a Spider Bake Sale selling Spider Donuts and Spider Cider for G, which you get by killing monsters. You will also find the Training Hall. Kill Frogits in the Training Hall until you have 3000 G, Using the G whenever you need to, to buy spider food. If you have a high level friend who can weaken all the frogits for you it can really help, but it is perfectly possible to farm the 3000 G alone.

Once you have 3000 G, reset, then, from the spawn point, look towards the Ruins. There should be a black and purple icon with a sign next to it saying "< Tem Shop". Go into the Tem Shop, which is basically Temmie Village as well. This is like the game's central hub, where you'll find the shop, the portals to Hard Mode and the Tem Trials, where you can find other games made by Bowtiedpony, and where you can buy morphs. You can fight a secret meme boss as well here. For now, go to the shop, where you can buy several different kinds of food. You can get Temmie Flakes ( Or, if you are lucky, Special Temmie Flakes ), Starfait, Legendary Heroes, and Face Steaks. You can also buy weapons. Buy the Toy Knife with the G you saved up. Your Stick does 0.75 damage. The Toy Knife does 1. Now you can have fun with the actual bosses. There is another training area too, go to Snowdin ( Note Shortcut in the corner it skips the whole forest ) and keep going until of to the right you will see a Lesser Dog. Go into the teleportation thing to fight 3 Lesser Dogs.

Now have fun with the bosses and use the link at the top of the page if you need help. Also, during your first few levels of the game, you should probably start grinding G for the Frying Pan, which does 1.25 damage. It costs 10 000 G and you get it at  the Tem Shop. Despite the daunting number, it is somewhat easy to get.

Also one final thing is inviting. Whenever you enter a boss fight, you can click the blue button in the bottom right corner of your interface, someone you choose gets the invite and if they come, you can fight the boss together. It is super hard to beat the game without inviting, so make it a routine to spam the invite button whenever you enter a boss fight. If you click "Invite All" everyone in the server will get the invite. To accept an invite, a boss will appear in the top right corner of your interface saying:

( Player username ) invited you to ( Boss name )

Below that there will be a Yes button and a No button. Click Yes and you get teleported to the boss. Click No and the invite disappeared. React fast because a few seconds later the invite disappears!

Also here is a list of the bosses in Undertale realm.

• Toriel ( Go in Ruins )
• Papyrus ( Go to the shortcut to snowdin from spawn and keep going straight he is at the end )
• Muffet ( Go to Spiderlands, she's easy enough to spot )
• Mettaton EX ( Go into Hotlands and keep going straight. He's in the Lab )
• Undyne ( Go to the Waterfall, round the corner, turn left )
• Sans ( Go to the Hotlands, but this time go left you will see Judgment Hall. Go through and in the Last Corridor you will see Sans, its a long fight though )
• Asgore ( From Sans, go straight more. You will see Asgore in the Throne Room )
• Photoshop Flowey: Lv 5+ ( Go past Asgore ( And yes, I will be honest, it is long way ) into the Barrier )
• Asriel Dreemur Lv 10+ ( Go past Asgore ( And yes, I will be honest, it is long way ) into the Barrier )
• Chara Lv 20+ ( Beat Sans when you are level 20 or higher and you will fight Chara )
• Gaster ( Secret boss, more details on how to reach him below )
• Error!Sans ( Also detailed below )

Now for Gaster and error.

For Gaster, go click on the purple poster of Mettaton in the Lab, then click on the black door downstairs to enter the True Lab. Here, click on all the black tablets, so they say "Connecting", then at the end, click on the tablet that says "Offline" ( and by the way, dont bother with endogney ). You will be transported to the Void with Gaster's grey door right in front of you. Enter to begin the surprisingly, incredibly difficult fight with Gaster.

Now to reach Error!Sans, umm........ Well... You see, the way it works is that he kidnaps a random player in the server every 40 minutes or so. So it is a incredibly elusive fight. If someone does get Error, get food ( 6 Face Steaks are ideal ), then tell them to invite you. If you get it, you will see the transporter in front of you in a black room. Good luck and enjoy.

So I guess that concludes this page. Have fun and if you see any typos or false info, then note it in the comments, I will see to it that my information on this page is true. Hopefully you found this page useful!