we're glad at least the code is clearly for the second room. It isn't said so planely cuz we wanted the player to wonder and discover, what the code does is open the portal from the 4th room back to the 3rd room so after you unlock the dash you can come back and get the key, hance "the portal of no return". We'd be really happy if you wanted to try the rest of our game now that you know how to continue and find out more about the story. Sorry for everyone else reading the comments that i spoiled the puzzle.