There is purple block that has water streaming out of it and has lights on it that light up in tetris shapes depending on if I hit right, left, down, up, RB, LB or jump. I can figure out what pattern the lights are supposed to go in to move on.
It is indeed a puzzle! It'll also teach you how all the tetris' puzzles work. When your read the puzzle tilt your head 90 degrees to te left and follow the sequence. Pen and paper required unless you have an amazing memory!
It IS a puzzle, I found a poster in the neon city with the sequence that shows you exactly how to solve it. When you first reach the neon city, go to the 3rd level up and there is a classroom (same one with the QR code to get an anti-cube) and rotate the room until you see the poster on the wall with the sequence on it.
Admittedly, I found the decoded directions first, but I haven't had a problem with any of the directional puzzles until this one. I found that list in the classroom, and this is the sequence that I got it using the directions that I had been using the whole time:
U L RB A LB R A D
I've also tried tilting the message and writing it backwards and got the following sequences:
R U RB A LB D A L L D RB A LB U A R U A L LB A RB R D R A U LB A RB D L
Nothing happens with any of these. What am I doing wrong?