I bought and found all the potions and still didnt get the medal :/
there is a glitch when i die, is just black and i hear the music
by the ( can you kill the shop keeper ) guy lol
I got on the second floor and I need a key if you can help me with a puzzle tip (the room that the tip is, etc ...) I accept.
I realized that it has to do with the number of rooms
so i got to that first puzzle with the QR code. minus a star.
then the second puzzle with the grid of light pads. there was literally NO clue in the room for solving that puzzle. minus another star.
QR codes contain solutions, you can solve puzzles without scanning them. Hints are not located in the same room, but they are hidden on the same floor. Here is the screenshot with the hints for the first puzzle: https://imgur.com/Bub0Y6o
Hints for the second one are scattered all around the second floor.
Anyway puzzles unlock HP upgrades and you can beat the game without solving them. Hope this will help :)