Screenshot of the same spike room taken just as Glenn finishes the puzzle.

third puzzle:
PASSED ! !

COMMENT(S):

9/21/2015 12:22

⭐⮝+3⮟

UsernameJ62BDSM:

how did you solve it ???
i cant pass the spikes !!

9/21/2015 17:10

⮝-2⮟

UsernameWEQ6767:

idiot

9/21/2015 17:11

⮝-1⮟

UsernameWEQ6767:

like your actually stupid its not even a real puzzle

9/21/2015 19:39

⭐⮝+7⮟

SupergGlenn:

simple! I used this image to remember the place when i died each time !
What looks like a game screenshot, but it's way too small to see anything properly.
-SuperGlenn

9/22/2015 09:20

⮝+2⮟

UsernameJ62BDSM:

thank you glenn ! ! !

9/22/2015 09:33

⮝+1⮟

Usernamehotpepperonibabe:

your my hero, super glenn...

9/22/2015 10:01

⮝+0⮟

UsernameJ62BDSM:

it doesn't work . . .

9/21/2015 14:50

⮝+1⮟

gameboy:

The room to the west gives you a clue...


Here's a better look at Glenn's "solution" to the puzzle.

Screenshot of the same puzzle with many red marks drawn on the spikes, a vague path is visible.

This is Glenn's first Undertale puzzle guide.
(It was actually that small in the original post.)