In the blue crystals part of the cave (after the second dream), there's this math thing, but I don't understand how I'm supposed to solve these, and what's the purpose of the grey squares with the arrows? Also, the chest at the beginning of that room, what am I supposed to do with that? being able to zoom out and see the room as a whole would be nice....

I'm stuck on the part where it looks like the 1st dream Roy had but now I can go to the left and down. When I go down, there is a room with a whiteboard and some broken and non broken pillers and there is also a door but I don't know what the code is to open it. How do I figure out the code?...

So I'm stuck at the second puzzle (Ray's second dream) - there is a bunch of squares and circles and some sort of a hint on the whiteboard. The problem is, I don't understand what am I supposed to do to get the code

In the hospital, past the computer room, in the lobby, the code for the door 19901 is "written" on the floor in tiles.Later when you return the door in the centre position in the left side of hospital has a 7 digit code. the room in the lower position shows on the whiteboard what the square and circle symbols mean, rendering the code as 51915 to open the stairs down. The room downstairs has a 7 digit answer key. On the 7 digit code you press upx4 in first position etc, making the code 4719351...

I've not been able to progress past the blue cristal room in the cave where the chest is at the start