tnx for ur comment first!
In that puzzle, my assumption was this:
Players go near the locked door and do interaction. Then the door says " 1 green, 2 red, 2 blue"...
And then they should realize what that means... But it seems my assumption was wrong!
I was thinking that maybe putting an intractable sign near the tiles can guide players not to confuse. After the player interacts with the sign, it says whatever the door is currently saying...