Return to Grace

After you ride in the pod, you'll immediately face the final security door. The solution for the door is a backwards Z.

o o o o o o o
x o x x x x x
x x o x x x x
x x x o x x x
x x x x o x x
x x x x x o x
o o o o o o o

o = Light on
x = Light off

I don't know if it helps, but I turned on all of the lights I needed before turning off the unwanted ones. I've seen people saying it didn't pop for them, so technique might matter.

I do not believe that the first 2 doors matter. Not only does the description only talk about a singular door, but I definitely fumbled around with the 1st door and still got the achievement when unlocking the 3rd. Just in case it does matter, I'll add the solution to doors 1 and 2 below.

Door 1.
x x x x x x x
x x x x x x x
x x o o o x x
x x o o o x x
x x o o o x x
x x x x x x x
x x x x x x x

Door 2.
o x x x x x o
x o x x x o x
x x o x o x x
x x x o x x x
x x o x o x x
x o x x x o x
o x x x x x o

I just want to add something I've noticed. I don't think the achievement has anything to do with the first 2 doors. The first time I did the 3rd door in the 21 moves, but took too long and the computer said something along the lines of "So you don't know what a backwards Z is"? It was only when I reloaded the save and did it quicker without hearing that dialog did the achievement unlock. So it appears to be a timed achievement.

There are THREE security doors you'll need to unlock using a little light box pattern. Touch a light to turn it on or off.

The first pattern is a block of nine squares in a 3x3 square in the centre of the panel.

The second pattern is a large X running corner to corner of the panel.

The third pattern (after taking the transit pod) is a large, reverse Z running corner to corner. So just like the letter Z, but with the diagonal line going top left to bottom right instead of top right to bottom left.

Ooen all three doors without hitting any incorrect lights and the achievement will unlock after the third door.

The other guides roughly indicate the right idea, but are missing some details, it's not just press the right buttons on the 3rd elevator, but also the number of movements count.

This video guide shows a successful run (around 43:36 in):


(credit to The Welsh Hunter)

For those who prefer a textual guide, this is the set of movements that if you follow will get you the achievement (L = left, R = right, U = up, D = down, P = press A, "off" means the press resulted in turning a light off):

URURUP
LP
LP
LP
LLP
DRP
DRP
UP
DRDP
RP (OFF)
DP
DRDP
LP
LP
LP
LP (FINISHING BOTTOM ROW)
RRUP (OFF)
LLUP (OFF)
LUUP (OFF)
RRDP (OFF)
RRRUP (OFF)

After the last extra light is turned off, the puzzle finishes and the achievement should pop.