This guide assumes you are already in extremely late game, and will not have any specifics on how to unlock any particular letters or passageways. By nature, talking about this ending involves spoilers, so be warned that from here on some spoilers will just be in the open. I'm assuming you basically have everything unlocked, if you don't think you've finished nearly everything in the game and already have many ending achievements, you probably shouldn't read any further. This is more or less the last thing you should be going for in the game.













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Spacing for spoilers

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This ending involves putting all your letters back into slots around the map, so you no longer have any letters. At a bare minimum, you should have all cyan letters, and all shortcuts in the Control Center opened, but note that as you start putting letters away you'll no longer be able to solve puzzles involving them, so all passages needed to get around need to be opened already. If you don't read anything else at all and decide to look for yourself, just know that you NEED to do J and Q first, do not start attempting to put any other letters back before those. J and Q need to be done first as they involve many alternate solutions in order to unlock their spots, so you still need access to most of your letters. You should also answer the puzzle in the room where your progress is tracked beforehand, the black sphynx room, as it requires a number of letters to spell Lavender. Some others that may require some amount of doors to be left open are (A,D,N,Y), please let me know if I forgot any others.

Progress can be tracked from the aforementioned black sphynx room, accessible from
putting ZERO into the control center then walking through the O of the word that appears behind you

J -> through red door (opened by control center) in The Great, solve every puzzle with alt solutions containing a J
Q -> where you get purple Q (at start of Daedalus), solve every puzzle with alt solutions containing a Q
You should also answer the puzzle in the black sphynx room, as it requires a number of letters to spell Lavender. Note this isn't strictly necessary, as the letters can still be put in place without this solved, but it is part of the intended solution path.

Not as extreme as J and Q, but some other letters may require some doors to be open to access them, check to make sure the path to each of these is open before putting too many letters away:
A,D,N,Y
At least for these, if you mess up, you won't have to retrieve as many letters solve the way open.

A -> in the tan building "Four Rooms" in Daedalus where you get cyan A, easiest way to get here is to take the yellow archway of the 4 colored arches. it's directly across from where you get the letter, behind a door with answer "Hunchback"
B -> in The Hive (take the castle painting in The Gallery, then jump in the moat and enter the rust colored passage)
C -> in lavender cube in Daedalus, next to painting that looks kinda like a C and a painting of a sea (take castle painting in The Gallery, turn around and it's on the left outside)
D -> in fuchsia building next to bee colored building in Daedalus, take 3rd Daedalus painting on left in the gallery, go to the right through cyan Z room until you hit the far green wall, turn right and then immediately left before hitting bee colors. Video going to spot: https://youtu.be/eki1Bi7Jd8c
E -> leave in control center slot, spelling "ZERO"
F -> in orange smile room in Daedalus, looking into a golden F just outside. I just jump on the roofs from the top of the castle to get here.
G -> in golden letter G on ground in Daedalus, by green pyramid (2nd Daedalus painting on left in The Gallery)
H -> in golden letter H on ground in Daedalus, by orange hedge maze (2nd Daedalus painting on right in The Gallery, immediately visible if you turn)
I -> in The Unkempt (green hedge area), access from 3rd shortcut going from control center, numbered in distance from the control panel
J was already covered in the first section, you really should have done this already
K -> in The Tenacious (access from 7th shortcut going from control center, numbered in distance from the control panel)
L -> purple P/F room, access from 1st shortcut, going from control center numbered in distance from the control panel
M -> where you got purple E, use smiley with a crown painting in The Gallery
N -> in The Shop (from The Entry, answer "treat" instead of trick in first room to the right, this will open the path to the shop in the Ink panel room)
O -> leave in control center slot, spelling "ZERO"
P -> backside of "P" drawing in The Gallery
Q was already covered in the first section, you really should have done this already
R -> leave in control center slot, spelling "ZERO"
S -> Tan door in The Unyielding, access from Blue/yellow/red painting in gallery
T -> put in lavender cube in cyan G room, access from The Darkroom's 2nd room, bright exit on rear wall (use black painting in The Gallery)
U -> in lavender cube in The Parthenon, use archways painting in The Gallery
V+W -> in The Unkempt (green hedge area), access from 3rd shortcut going from control center numbered in distance from the control panel, in the cyan W room (V goes on the purple side)
X -> near the back of The Great, to the left of the orange pyramid, in the ground
Y -> where you get cyan T in The Great, either go through the entrance where you got purple Y or the back way "Do Ewe Know"
Z -> leave in control center slot, spelling "ZERO"

Once you've put all your letters away and can no longer spell anything, make your way back to the black sphynx. Hopefully, every letter is green on the panel, and you can claim your ending. If not, fix any ones that are missing or red still.