A list of all the locations of the secret codes needed to unlock the bonus levels.
Introduction
After you complete level Y2.5, you are told you need to find a 4-digit code for a red door. From that point onward you can find hidden secrets that reveal 1 or 2 digits of this code and potentially where those digits occur in the code. If you find 5 of them, you will earn the Explorer achievement. Other than those 5 and the code itself to unlock the red door, there is no tangible reward for finding more or even all of them.
The code itself is random each time you start a new game, but the secret code locations and which digit(s) the code reveals is always the same.
This guide serves more as a way to find codes for what digits you are missing as you near the end of the game. You can find the full 4-digit code even if you’ve missed every single secret up until the end of Chapter 6.
Secret Stats
39 Secrets Total
Single Digit Secrets: 35
Double Digit Secrets: 4
Codes that contain the 1st digit: 9
Codes that contain the 2nd digit: 11
Codes that contain the 3rd digit: 13
Codes that contain the 4th digit: 10
Chapter 2 Secret Codes
2 Secrets
Digit Counts:
1st
2nd
3rd
4th
–
1
1
–
Secret 1
Y2.6
_ # _ _
The first code is easy to find, as it is clearly visible after the steam explosion happens.
Secret 2
Y2.6
_ _ # _
Behind a desk in the side room after the steam explosion.
Chapter 3 Secret Codes
6 Secrets
Digit Counts:
1st
2nd
3rd
4th
3
1
2
1
Secret 3
G3.1
# _ _ _
This is against a black cube as you jump down into the generator area.
Secret 4
G3.1
_ _ _ #
Located behind the furthest generator on the lower floor.
Secret 5
G3.1
_ _ # _
Turn around just before entering B3.2 to find this one below the piston used to break the glass.
Secret 6
B3.2
# # _ _
You can reach this one by using the soft cube G.U.M.
Secret 7
B3.3
# _ _ _
It’s hidden at the end of a path in the upper corner of the level.
Secret 8
Y3.4
_ _ # _
This one is on the wall beside the soft cube on a chain. You’ll have to jump and reveal it mid-air.
Chapter 4 Secret Codes
6 Secrets
Digit Counts:
1st
2nd
3rd
4th
1
2
2
2
Secret 9
G4.1
_ # _ _
Just before the spinning cube part, turn around to find this one.
Secret 10
G4.1
_ _ _ #
In the upper corner of the large room at the end of the level.
Secret 11
Y4.2
_ _ # _
In the top corner beside the yellow cubes/opening to the exit.
Secret 12
Before B4.3
_ # # _
This is behind the door of the room where all of the wires meet.
Secret 13
B4.3
_ _ _ #
Beside the yellow pistons at the bottom of the last section of the level.
Secret 14
B4.3
# _ _ _
Turn around just as you enter the green walled section of the end of the chapter.
Chapter 5 Secret Codes
12 Secrets
Digit Counts:
1st
2nd
3rd
4th
3
3
3
4
Secret 15
B5.1
_ _ _ #
Head into the corner underneath the entrance to the level.
Secret 16
G5.2 above
# _ _ _
After you turn off the yellow G.U.M., gravity blast your way up to the top of the level to find it.
Secret 17
G5.4 north
_ # _ _
After you jump across the green pistons, fall down into the gap and look behind the wall at the end.
Secret 18
Y5.5 north
_ _ # #
On the second floor of the last section with the green pistons that raise you up.
Secret 19
G5.4 south
_ # _ _
Behind glass at the side of the bottom half of the level.
Secret 20
G5.5 south
# _ _ _
At the end of the level beside the red laser barriers.
Secret 21
G5.5 south
_ _ # _
Turn around as you are exiting the music room and entering the upper half of G5.4 south.
Secret 22
G5.5 south
_ _ _ #
Gravity blast your way up to the top of the collapsed stairwell after completing G5.4 south.
Secret 23
B5.6
# _ _ _
You’ll have to run off of the gravity cubes towards the code to reveal it mid-air.
Secret 24
G5.7
_ _ _ #
Turn around just as you jump into G5.7.
Secret 25
G5.7
_ # _ _
Turn around at the glass entrance to B5.8 to find this one on the ceiling.
Secret 26
B5.8
_ _ # _
At the bottom-most part of the level, behind the ramp to walk back up.
Chapter 6 Secret Codes
7 Secrets
Digit Counts:
1st
2nd
3rd
4th
2
2
2
2
Warning: This chapter is the last chance you have to reveal the first digit of your secret code. Chapter 7 and 8 do not have any codes with the first digit.
Secret 27
Y6.1
_ _ # _
Beside the ramp going down into the second section of the level.
Secret 28
Y6.1/G6.2
_ _ # _
Along the shaft you push the soft cube up.
Secret 29
Before Y6.3
# _ _ _
After Y6.1/G6.2 while in the back end of the glass tube. Jump down to see it.
Secret 30
Y6.3
_ # _ _
On the ledge opposite the entrance to G6.4. Use the green G.U.M.s to get up here.
Secret 31
G6.4
_ _ _ #
Behind the small pillar in the corner of the lower section you use while climbing back up into Y6.3.
Secret 32
After G6.4
# _ _ _
Under a pipe during the steam explosion hallway.
Secret 33
After G6.4
_ # _ #
Inside the fuse box that unlocks if you don’t move during the steam explosion hallway.
Chapter 7 Secret Codes
4 Secrets
Digit Counts:
1st
2nd
3rd
4th
–
2
2
–
Warning: This chapter is your last chance to reveal the second secret code digit.
Secret 34
G7.1
_ _ # _
Along the gravity cubes as you’re climbing up the level.
Secret 35
After G7.1
_ # _ _
Right after G7.1, behind the lower staircase.
Secret 36
B7.2
_ # _ _
Behind the lower left pillar, below where you drop into the level.
Secret 37
B7.2
_ _ # _
In the corner of the area SAGRO comes out of.
Chapter 8 Secret Codes
2 Secrets
Digit Counts:
1st
2nd
3rd
4th
–
–
2
2
Secret 38
Before SAGRO
_ _ # _
Behind the left staircase at the start of the chapter.
Secret 39
SAGRO Phase 3
_ _ _ #
Right before landing the final blow on SAGRO, the last secret is up in the corner of the piston room. You will need to use the gravity blast turret and to position yourself properly to be able to reach it.
Written by Furdabip
