I took a look!
So, the blue and red info for the 3 part 9 mushroom puzzle won't be available until later in the tunnels.
As for the answer key of the puzzle to the right of the blue mushroom, simply go straight up from the top of the blue mushroom (to room 4H on the walkthrough map)! You'll find a Mush smash minigame there, clearing it will reveal the answer ^^