To solve the 12 door puzzles in Hogwarts Legacy, you must figure out what the missing numbers in the triangles on the door are.

Then turn the symbols by each door to the animal that corresponds with the following numbers from the Arithmancy Study Guide.

For example, in the picture below, the bottom triangle has the number 11 in the middle and a 5, 1, and ? surrounding it. Your job is to find out what the final number is in the equation: 5 + 1 + ? = 11.

player character encountering a door puzzle in Hogwarts Legacy

In this case, the answer would be 5, as 5 + 1 + 5 = 11.

To solve the puzzle, you must therefore change the nearby symbol to the crab-like creature that corresponds with 5 in the Arithmancy Study Guide Page.

Read More – How to Follow Rowland Oakes’ Map in Hogwarts Legacy

Here is a complete breakdown of how to solve the door puzzles in Hogwarts Legacy:

  1. Locate a Door Puzzle
  2. Identify the Missing Numbers
  3. Add up Available Numbers & Subtract From the Total Value
  4. Change the Symbols
  5. Jump Straight To The Answers

Locate a Door Puzzle

  • There are 12 door puzzles across Hogwarts. They are near:
    • Divination Classroom Floo Flame
    • Potions Classroom Floo Flame
    • Charms Classroom Floo Flame
    • Ravenclaw Tower Floo Flame
    • Grand Staircase Tower Floo Flame
    • Faculty Tower Floo Flame
    • Transfiguration Classroom Floo Flame
a map of hogwarts with the locations of door puzzles circled

Identify the Missing Numbers

  • Look at one of the two triangles on the door and identify the number in the center of it.
    • This is the total you want the numbers surrounding the triangle to add up to.
  • Identify the numbers surrounding that triangle.
  • The circles with a ? or ?? in them are the missing numbers.
    • The ? and ?? correspond to which symbol next to the door you need to change.
the missing numbers on a door puzzle in Hogwarts Legacy identified

Add up Available Numbers & Subtract From the Total Value

  • Add up the numbers that you can see on your chosen triangle.
    • Sometimes one of the numbers is an animal or creature. Look at the Arithmancy Study Guide Page located in your inventory to figure out what number it corresponds to.
  • Subtract that total from the number in the middle of the triangle. This is the missing number.
    • For example, if the middle number was 9 and it’s surrounded by a 2 and a 3, the missing number will be 4 (as 4 + 2 + 3 = 9).
the numbers needing to be added up on a Hogwarts Legacy door puzzle

Change the Symbols

  • Locate either the ? or ?? symbol near the door (depending on which one has replaced the missing number on the triangle you are solving)
    • In some cases, either the ? or the ?? symbol is located far away from the door, so make sure to explore around.
  • Change the symbol to the animal that corresponds with the number you have found.
    • Don’t forget to use the Arithmancy Study Guide Page to help you with this.
  • Repeat for any additional triangles.
a symbol from a door puzzle in Hogwarts Legacy

You will need to use the Revelio spell on some of the doors to reveal the puzzle. Fortunately, Revelio is one of the first spells you learn in Hogwarts Legacy.

What Do the Door Puzzles Symbols in the Arithmancy Study Guide Page Represent?

Here is what each of the door puzzle symbols on the Arithmancy Study Guide Page represents in Hogwarts Legacy:

  • Demiguise Owl – 0 
  • Unicorn – 1
  • Graphorn – 2
  • Three-headed Serpent – 3
  • Owl on Perch – 4
  • Crab-like Creature – 5
  • Salamander – 6
  • Tentacle Creature – 7
  • Spider – 8
  • Hydra – 9

Read More – Where to Find Every Astronomy Table in Hogwarts Legacy

This is what the Arithmancy Study Guide Page looks like:

the Arithmancy Study Guide Page

All door puzzles in Hogwarts Legacy will use this reference sheet, so you can refer to this article anytime you have one to solve. Otherwise, check the bottom of the page for a guide to finding it for yourself!

If you forget and don’t feel like looking at the guide page every time, you can look at the symbols on the outside of each door. It starts at 0 from the bottom left all the way to 9 on the bottom right.

numbers in ascending order from left to right on a door puzzle in Hogwarts Legacy

If you’re struggling to solve these door puzzles, don’t panic, as we have the solution below. After all, there’s so much side content in Hogwarts Legacy it would be a shame to waste all your time looking at doors.

All 12 Hogwarts Legacy Puzzle Door Solutions & Rewards

Here is every solution and reward for the door puzzles in Hogwarts Legacy:

Read More: Hogwarts Legacy Bridge Fire Puzzle Guide & Solution

Arithmancy Classroom Walkway Door Puzzle (9 4) Solution

  • Location – Library Annex – Divination Classroom Floo Flame.
    • Turn right and head up the stairs. Walk across the wooden walkway and then take the first right. You’ll see the door puzzle at the end.
      • ? symbol is 4 (Owl on Perch)
      • ?? symbol is 3 (Three-headed Serpent)
      • Reward: Lights Collectible + Leather Sorcerer Hat (in Arithmancy classroom chest) + more door puzzles
the first Divination Classroom Door puzzle solution

Arithmancy Classroom Door Puzzle (15 18) Solution

  • Location – Go through the first Arithmancy Classroom door puzzle that will have opened once you solved it. Head down the corridor and then through the door on the left.
    • This puzzle is the one directly to the left of the Arithmancy Classroom entrance.
      • ? symbol is 4 (Owl on Perch)
      • ?? symbol is 5 (Crab-like Creature)
      • Reward: Purple Dragon-Eyed Spectacles + Hippogriff Statue Collectible
the second Divination Classroom Door puzzle solution

Arithmancy Classroom Door Puzzle (17 8) Solution

  • Location – Go through the first Arithmancy Classroom door puzzle that will have opened once you solved it. Head down the corridor and then through the door on the left.
    • This puzzle is the one directly ahead of you as you enter the Arithmancy Classroom.
      • ? symbol is 6 (Salamander)
      • ?? symbol is 1 (Unicorn)
      • Reward: Mormaer Robes + Quidditch Equipment Shelf Collectible
the third Divination Classroom Door puzzle solution

Grand Staircase Door Puzzle (13 21) Solution

  • Location – The Grand Staircase – Ravenclaw Tower Floo Flame
    • Head straight past the Ravenclaw Tower Floo Flame and into the next room. You’ll find the door puzzle on the right.
      • ? symbol is 4 (Owl on Perch)
      • ?? symbol is 5 (Crab-like Creature)
      • Reward: Feline Plates Collectible + Crimson Top Hat
the ravenclaw tower door puzzle in Hogwarts Legacy

Grand Staircase Door Puzzle (23 19) Solution

  • Location – The Grand Staircase – Grand Staircase Tower Floo Flame
    • Head down the staircase until you reach the landing with the door puzzle on it. The ? symbol is located on the wall to the left of the door, and the ?? symbol is located opposite the door. 
      • ? symbol is 6 (Salamader)
      • ?? symbol is 7 (Tentacle Creature)
      • Reward: Cabinets Collectible + Leather Longcoat
the door puzzle at the top of the grand staircase in Hogwarts Legacy

Reception Hall Door Puzzle (6 11) Solution

  • Location –  The Grand Staircase – Grand Staircase Floo Flame
    • Head up the stairs and towards the House Hourglasses. Go up the stairs opposite the House Hourglasses. You will see the door puzzle to the left when going up the stairs.
      • ? symbol is 0 (Demiguise Owl)
      • ?? symbol is 5 (Crab-like Creature)
        • The ?? symbol is found at the top of the Hufflepuff Common Room staircase.
      • Reward: Ruined Stairway Collectible + Orange Eye of Newt Goggles
the door puzzle at the bottom of the Grand Staircase

Charms Classroom Door Puzzle (5 12) Solution

  • Location – The Astronomy Wing – Charms Classroom Floo Flame
    • Head past the Floo Flame and turn left when you reach the next staircase. The puzzle door is there.
      • ? symbol is 2 (Graphorn)
      • ?? symbol is 7 (Tentacle Creature)
      • Reward: Free Standing Clocks Collectible + Unidentified Back Item
the charms classroom door puzzle in Hogwarts Legacy

Potions Classroom Door Puzzle (9 4) Solution

  • Location – Library Annex – Potions Classroom Floo Flame
    • Turn around after fast traveling to the Potions Classroom Floo Flame, and you’ll see the door puzzle opposite you. It is next to the door that leads out into the Transfiguration Courtyard.
      • ? symbol is 8 (Spider)
      • ?? symbol is 3 (Three-headed Serpent)
        • The ?? symbol is found on the floor directly above the door puzzle.
      • Reward: Telescope Collectible + Striped School Robe
the central hall door puzzle in Hogwarts Legacy

Library Annex Wing Door Puzzle (22 9) Solution

  • Location – Library Annex – Potions Classroom Floo Flame
    • Go through the double doors and then turn left down the stairs. You’ll see a locked door in front of you, so cast Alohamora Level 1 on it. Once through, head down the corridor until you encounter another set of stairs. Look to your left, and you’ll see the door puzzle.
    • You’ll need to have the Alohamora spell unlocked to access this puzzle door
      • ? symbol is 2 (Graphorn)
      • ?? symbol is 1 (Unicorn)
      • Reward: Collectible + Piece of Clothing
the bell tower wing door puzzle in Hogwarts Legacy
Credit – Windows Central

Faculty Tower Door Puzzle Solution (13 14) Solution

  • Location – South Wing – Faculty Tower Floo Flame
    • To access this door puzzle, you need to begin The Caretakers Lunar Lament sidequest given to you by Gladwin Moon. Once you’ve started the quest, cast Alohamora Level 1 on the locked door and head up the stairs. Across from the walkway, you’ll see the door puzzle.
    • You’ll need to have the Alohamora spell unlocked to access this puzzle door
      • ? symbol is 0 (Demiguise Owl)
      • ?? symbol is 9 (Hydra)
      • Reward: Collectible + Piece of Clothing
the faculty tower door puzzle in Hogwarts Legacy
Credit – Windows Central

The Great Hall Door Puzzle (24 14) Solution

  • Location – The Great Hall – Great Hall Floo Flame
    • Upon entering the Great Hall, turn to the left towards the fireplace. Next, turn left at the fireplace and head down the hall until you reach the door puzzle
      • ? symbol is 8 (Spider)
      • ?? symbol is 3 (Three-headed Serpent)
      • Reward: Dwellings Collectible + Blue Four Eyes Spectacles
the great hall door puzzle in Hogwarts Legacy

North Hall Door Puzzle (10 7) Solution

  • Location – The Astronomy Wing – Transfiguration Classroom Floo Flame
    • After fast traveling to the Floo Flame, turn around and go through the doors. Next, head up the stairs until you reach the top floor. There will be a small locked door requiring you to cast Alohamora Level 1 on it. Do that, and then go through the room until you find the door puzzle at the back. 
    • You’ll need to have the Alohamora spell unlocked to access this puzzle door
      • ? symbol is 6 (Salamader)
      • ?? symbol is 3 (Three-headed Serpent)
      • Reward: Collectible + Piece of Clothing
the north hall door puzzle in Hogwarts Legacy
Credit – Windows Central

How to Find the Arithmancy Study Guide Pages in Hogwarts Legacy

There are several Arithmancy Study Guide Pages to be found. They’re all located in chests near the puzzle doors themselves.

However, they all show the same guide to solving these puzzles. The easiest one to find is opposite the door puzzle near the Divination Classroom Floo Flame in the Library Annex.

It’s unclear if locating all of these guide pages and solving these puzzles will affect which of Hogwarts Legacy’s multiple endings you’ll get. So, you’re safer hunting them all down, just in case.

Here is a complete breakdown of how to find the Arithmancy Study Guide Page near the Divination Classroom Floo Flame:

Go to the Divination Classroom Floo Flame

  • Travel to the Divination Classroom Floo Flame.
    • It is located in the Library Annex Location. Select it and then mark the Divination Classroom Floo Flame to set a waypoint.
  • Turn right at the Floo Flame and head up the stairs.
the player in the Divination Clasroom Floo Flame on the left and a map of Hogwarts on the right

Head Across the Wooden Walkway

  • Cross over the wooden passage until you see a passage on the right.
  • Head down that passage, and you’ll find a door puzzle.
the Divination Classroom door puzzle location

Open the Chest

  • Opposite the puzzle is a chest.
  • Interact with it.
  • Inside is the Arithmancy Study Guide Page.
the Arithmancy Study Guide Chest location

If you need to access the Arithmancy Study Guide Page at any time, simply head into your Inventory and go to Quest Items.

author
Former Staff Writer
Whether it's an indie platformer or a 100-hour JRPG, Tom loves talking about games. So much so, he made it his career. Since starting in 2020, he's covered a wide range of topics at sites including TheGamer and The Game Crater.