Follow our crystal clear walkthrough and helpful tricks to get you through the rough spots!

Take PORTAL COMBINATION 1/3 (A).

Remove the poster (green); take the MAILBOX CLUE (purple).

Put down the MAILBOX CLUE (B); enter the correct code (C) and take the KEY (D).

Insert the KEY into the lock (E); turn the key.

Move forward.

Take the note (F).

Open the book; take PUZZLE PIECE 1/2 (G).

Play the HOP.

You receive the artifact (H).