Door2:Key – 100% Walkthrough(All keys & Achievements)

• Casual saves collected key and open gate progress.
• Einstein is like a fresh start at the beginning if you fail.

Known bug & work around.
If you goto Einstein mode and want to return to Casual you can’t. Someone has mentioned this in the discussions. A work around is open RegEdit and delete Door_next.

• Full path: HKEY_CURRENT_USER\Software\SVGames\Door_next

You start in Chapter 1 which leads you to Home. The hub so to speak.
From there you can go back to Chapter 1 or enter Chapter 2, Chapter 3, Chapter 4, Door 15 & Door 28.

30 Total

F.Y.I At time of this writing you don’t “spend” the keys.
So if you have 15 and open Door 15 you will still have those 15 keys to go towards Door 28.

• Castle Door – You completed chapter 1
• Garden Door – You completed chapter 2
• Construction Door – You completed chapter 3
• Memorial Door – You completed chapter 4
  • Templum – You opened the temple.
• Simulation – You finished the game (Door 15)
• Atom – You 0XFF32AA (Door 28)

8 Keys to obtain here.

• Walk through first door/gate.
• 1 2 3 4.
• Turn Left through arch
  • Ahead is the thinking statue and 4 doors on both the Left and Right.
  • Before that on your left is stairs and a grassy area, go through the left archways and follow around
  • Key 1/8 
  • Then go back.
    Skippable:
    • You can maneuver up the steps by pressing forward while sliding back and fourth along the step edges.There is a terminal here and you could bypass some doors if you wanted.
    • Back to the bottom of the steps.
  • Facing the thinking statue…
  • Skippable: Right set of 4 doors A=1 – B=2 – C=3 – D=4 then turn around.
  • Left set of 4 doors ▲3 – ⬟5 – ◼4 – ●1
  • Walk forward,
    You now face another set of 8 doors, 4 Left & 4 Right.
    • Left to open Gate A
    • 2 4 1 3
    • Doors with fragments on them. 4 3 1 2
    • Button open Gate A.
  • Go back.
    • Across from where you are to open Gate B.
    • 4 3 2 1
    • Button opens Gate B.
  • Go back to the room with the thinking statue.
• Back out to the bridge (Gate B).
  • ⬟4 – ◼1 – ▲2 – ●3
  • 1 4 2 3
  • Key 2/8 
  • Go back to the first room.
  • Go up the stairs to the left.
  • Key 3/8 
  • Turn around and just walk forward off the wall.
  • Skippable: To your left walk up to the 2nd door (Door ▲). You won’t need to go back, but in case you want to run around after.
  • To the maze ahead!
  • Before going in, Look at the Sign for the number. 1, 4, 9, 50
  • As you walk through this small maze it will only branch once. You will see door I – walk past it.
  • Key 4/8 
  • Back to the door.
  • Doors are I=1 IV=4 IX=9 L=50
  • Regardless of door, they all go to the same place.
    Walk to the only stone archway leading out.
  • Left towards the 4 doors.
  • 1 3 2 4
  • Key 5/8 
  • This doorway teleports you back to the room between the statue and maze.
  • Turn around and exit the doors you came in.
  • There is a small closed metal gate, (Main gate) .
  • Walk past it and you will see some boxes and a stone wall ahead.
    • Stand on the small rock close to the larger box. Should be able to walk onto the smaller box. Sometimes stepping L and R and aiming for the notch in the box will help.
    • Once there, walk towards the corner of the next box.
    • See the notch in the cement, walk towards that.
      May need to push forward while hitting Left/Right to slide up.
    • Walk onto the bag.
    • Then the box.
    • Then against the piece of wall poking out.
    • You made it.
    • Key 6/8 
  • Turn around and through the open double archway (Gate A).
  • 4 3 2 1
  • Facing 4 doors with binary.
    2 3 1 4
  • Button for main gate.
  • Turn around and head back to the gate you passed a minute ago.
  • Right has 4 doors, Left has 4 doors.
    Same pattern. 3 2 1 4
    • Right set of doors: Key 7/8 
    • Left set of doors: Key 8/8 
• Exit through the double doors at the end of the courtyard and use the teleport.
• Achievement Castle Door (You completed chapter 1).
• Welcome to Home

This is where you arrive after Chapter 1 and every chapter provides a teleport back here.

Starting with: 8 / 30 Total keys.
3 to gain.

Remember, keys don’t “spend”. So you can open either Door 15 or 28 without worry.

• • 1 2 3 4
  • 2 4 1 3
  • Walk up the path.
  • Left
    • Towards the mansion with Door 28.
    • Left on the porch.
    • Left against the wall.
    • Follow the path around for a key.
    • 9 / 30 total keys. 
  • Go back to the start of the path.
  • Climb on the taller green shrub at the edge of the porch rail.
    • Your goal is to walk behind the Chapter IV area.
    • Follow till you see a stone wall then walk across that and back onto the shrubs.
    • Then right and walk towards the doors.
    • Ahead on the right you will see the glow of the key.
    • Key 10 / 30 total keys. 
  • Go back to the house.
  • Right side of the porch.
  • You can climb over the railing onto the same style shrubs next to that left wall.
    Look at the notch cut out of the railing, that’s your ticket over, just like the box in Ch1.
    • Walk towards Chapter III area this time.
    • Follow till you see a stone wall then walk across that and back onto the shrubs.
    • Left and you’ll see the doors.
    • Left off the shrubs is an alcove with the key.
    • Key 11 / 30 total keys. 
  • Go back to where you started and take Path Ⅱ.

11 / 30 Total keys
6 to gain

• 1 2 3 4
• 2 4 1 3
• Walk up the path and across to Ⅱ

• 3142
• 4231
• Teleport to Garden

• Straight ahead from start.
  • Metal gate with 4 doors.
    Terminal sign to the left.
  • ⬟5 – ◼4 – ▲3 – ●1
    • To the right of last door, there is a light yellow tree with a green shrub.
      Walk through and follow around.
    • Key 1/6 
  • Go back to the doors.
  • T M K I = 2 4 3 1
    • Through the door, turn left, walk across the lilypads in the river.
    • Ahead to the right you’ll see it.
    • Key 2/6 
  • Go back across the river.
  • 4 gate doors with symbols, 4 1 2 3
  • Clock on the ground, ⬟12 – ◼4 – ▲2 – ●6
  • Facing this structure.
  • To the right a small building with a gate door 5.
    I’ve only been able to enter this by going to it at the start of the game.
  • Key 3/6 
  • Follow around the opposite side (Left side facing the structure).
  • Key 4/6 
• Go back towards start.
• Leaving the last metal gate (first you entered).
• Go Left through archway.
  • Sign ahead: ‘Exit at door: Error’
  • Go through ⬟
    • Right
      • Button to open Gate C
        Access to button beside you. It opens the last key towards the end.
    • Left
      • Go through door 2.
      • Back out & into door 4.
      • Both 1 & 2 will work.
      • To your right is Door 3.
      • Start at Left door, walk into each.
      • Wooden door will now open.
      • Button for Gate A.
        Opens button to gate B (bridge).
      • Key 5/6 
• Go back toward start.
• The area Left / Beside the spawn.
• Go behind (NOT IN) the doorway showing a red room.
  • ⬟1.1 – ◼1.2 – ▲2.1 – ●2.2 – ⬟ – ◼
  • Any door.
  • Walk around the caged area & past the Gazebo.
    Fence in the distance with a opening (Gate C).
  • Press the button. Goes to final key after you get over the bridge.
• Go back towards start.
• Cross over the bridge (Gate B).
  • 1 3 2 4
  • Ahead 4 doors and to the Left a fountain.
    ——Skippable——
    • • • 2 4 3 1
        • 4 1 3 2
        • A scenic room with a terminal.

      ————————————

  • Back, Looking at the fountain.
    • Goto the far back Left corner.
      Follow into a room with stairs on the right and a few terminals ahead.
    • On the left side walk towards the break in the wall.
    • Check the number on the sign on your way.
    • If you walk past the doors, turn Left through an opening the stone.
      • Key 4/6 
    • 3 2 1 4
    • Teleport Home is here.
    • Achievement Garden Door (You completed chapter 2).
      P.S. Just walking closer will trigger it if you want to hang out and explore.

17 / 30 Total keys at this point.
6 to gain

• 1 2 3 4
• 2 4 1 3
• Walk up the path.
• Turn Right, Path Ⅲ will be on the Left past Door 15.

• 4 1 3 2
• 1 3 2 4
• Teleport to Building

• Turn around, walk towards corner of building to go inside.
• Entrance to your right.
• Step on floor tile that matches the terminal sign to open the door.
  1 2 3 4
• Next set of doors requires the same thing, but the plates are in different locations.
  • Ⅰ is in the room.
  • Ⅱ exit building, L or R it’s on the opposite corner by the stairs.
  • Ⅲ exit building, Right, in the corner by a terminal.
  • Ⅳ exit building, Left. Where you started.
• 4 doors w/ red wires, 4 1 2 3
• Go up the stairs.
• Floor 2
• 4 doors w/ blue wires, 4 3 2 1
• Push button to open Gate A.
• Stand against the door on the terminal sign.
  Put your mouse on the eye over the doorway you walked through.
• Key 1/6 
• Turn around, and go up the stairs.
• Floor 3
• Blue & red wires ahead. 1 2 3 4
• Key 2/6 
• Back out, next room.
• More blue & red wired doors 1 3 4 2
  • Look down over the edge and part of the building is poking out at Floor 2.
  • Drop down and press forward towards the building.
    So you land on the floor not the protruding piece.
    • Key 3/6 
  • Go back up to Floor 3.
    P.S. You can sprint forward and onto the staircase.
• Stone circles above doors. 4 1 2 3
• Ahead more stairs up.
  • But walk to the gap left of the stairs.
    Hug the wall and you can walk around to the left and drop onto an angled piece poking out.
    • Key 4/6 
• Get back to the stairs.
  You can sprint off the 2nd angled piece poking out to get on the stairs.
• Top of building.
• Switch to your right to change the weather cycle for the doors.
• Sun / Clear day: 4 3 1 2
• Moon / Rainy night: 2 3 4 1
• Moon / Rainy night: 1 2 3 4
• Moon / Rainy night: 3 2 1 4
  Thanks to Gantum for correction on last set of doors. Thought last set of doors had a bug 🙂 turns out I didn’t think of the pattern before.
• Teleport Home is here.
• Achievement Construction Door (You completed chapter 3)
• You have Door 6 & 7 and 2 keys still.
• Flip the switch back to Daylight.
  Drop off the building (or walk down the stairs if you prefer).
  Get to the building that has stairs in front. Left of the teleport Home.
• Walk up the stairs and up the side of the building.
• Doors with bits and pieces. _ 1 2 _ 3
• Walk on plate VI (6).
• Back to top of building, Door 6.
• Back to the ground floor.
• In the corner beside the teleport is a 60 second puzzle.
  5 sets of 3 doors.
  • 1 3 2
  • 3 1 2
  • 2 3 1
  • 3 1 2
  • Any door, provided you are under 60 seconds.
  • Key 5/6 
  • Plate VII (7). Must be daylight.
• Back to Door 7.
• Key 6/6 
• Now teleport back to Home.

23 / 30 Total keys at this point.
7 to gain

• 1 2 3 4
• 2 4 1 3
• Walk up the path.
• Turn Right, Path Ⅳ will be on the Right, past Door 15.

• 3 1 4 2
• 1 3 2 4
• Teleport to Memorial

• Looking at Amphitheatrum sign.
• Right
  • 1, 2, Button open Gate A.
  • Go back.
• Left
  • 4, 3, Button open Gate B.
  • Go back.
• Left.
  • 1, Button open Gate C.
  • Go back.
• Left to leave start area.
• Remember this big mansion ahead in the distance.
• Turn Left and follow the coliseum around until the building extends.
  • Turn Left into the open space in the coliseum.
    Go forward to the back wall, then right.
    • Key 1/7 
  • Go back out.
  • Left.
    Run to the end of this extended part of the building.
    • Left into another space in the coliseum.
    • Follow the path and in front of you 12 buttons.
      • First row 3
      • Second row 1
      • Third row 4
    • Key 2/7 
  • Go back out.
  • Walk out from under the extended part.
  • Turn Right and go forward to the wooden structure past the Magic Door.
  • Up the wooden ramp, 4 doors.
  • 4 1 2 3
    • Right
    • 3, 2, 2nd door, 3, turn left to go around, 3, 4
    • Walk up the wooden ramp.
      • Left
      • Key 3/7 
      • Walk through the door.
      • Teleport to Home is here.
      • Achievement Memorial Door (You completed chapter 4).
      • Turn around run to the end of the hall.
      • Look out the window on the right, notice that ledge around the building?
      • Follow it around to the end. It slopes back up so you can be at right height.
      • Key 4/7 
  • Drop out the window and back to the first wooden ramp.
  • Through the door you previously opened.
    • Left
    • Walk up the next ramp and from the edge of the porch drop to the box’s below you.
    • Turn around and walk forward. Now below the doors.
    • Key 5/7 
  • Go back to the ramp.
  • 3rd door, 4th door
  • Walk up the right dock and towards the mountain side.
  • Key 6/7 
  • Follow the cliff side up a short snowy slope.
  • Before the end, look left.
    An opening and a building with black columns.
  • Go through there and keep going that direction past the building to the large mansion mentioned at the start.
  • Climb the rocks and you’ll see one that is almost touching the 2nd floor.
  • Go there and walk into the window.
  • 20 buttons!
    • 1st row, 2
    • 2nd row, 1
    • 3rd row 4,
    • 4th row, 5
  • Thanks to Feyori for posting this code.
  • Head down from the Right (it’s closer).
  • Run to the Templum.
  • Achievement Templum (You opened the temple).
  • Leave the Temple.
  • Look left to see a wooden bridge.
  • On the left side against the mountain side you can climb up.
    Start at the smallest rock.
  • Key 7/7 
    Total 30 now.
  • Teleport back Home.
    • Where you started in the coliseum.
    • or up the wooden platform through the End of Simulation door

• 1 2 3 4
• 2 4 1 3
• Walk up the path.
• Turn Right, Door 15 is ahead.

• Walk up to the Terminal on the Right.
  Wall spins open.
• Walk into R or L corner to walk on the wall past the doors.
• Walk up to the Left terminal and click the white middle rectangle.
  Gate’s disappear.
• Walk through the archway.
• Follow the path forward until you see the stairs in the air and the back of the OPEN sign.
• You’ll probably want to go slow here since the camera flips all over the place. And you can fall out of this puzzle 😀
  • Up the grey ramp before the terminal with blue text.
  • Turn right.
    See the OPEN sign and another ramp up.
  • Turn left.
  • Walk up the LEFT ramp towards the blue, NOT the red.
  • Walk ahead towards the blue wall.
  • Turn Left, double ramp down.
  • Exit right.
• Walk forward & through the Exit.
• Achievement: Simulation (You finished the game)

• 1 2 3 4
• 2 4 1 3
• Walk up the path.
• Turn Left, Door 28 is ahead.

• 6 1 4 2 5 3
• 0 3 4 1 5 2
• 2 1 5 4 3
• Ahead on the wall, before the pillars, you can see the pattern to walk.
  First set of pillars, right 3 openings.
  Second & Third, left 2 openings.
• 3 clocks
  ⬟7 – ◼12 – ▲9 – ●11
• CCIX

  CLIX

  CIX

  LLLL

  209

  159

  109

  200
• Doors with many plates on the floor.
  Keep trying matching plate #s until the door opens as they change each run. While cleaning up the guide I got 2 on the sign, twice. But had to step on different Ⅱ plates to open it.

• Room with switch, 2 terminals & a button.
• Flip the switch. So much better on the eyes!
• Open door 3.
• Head back to the beginning.
• Through the door behind where you started.
• Achievement: Atom (You 0xFF32AA)

By Dahl