Take the letter (K) and HAMMER AND CHISEL (L).
Use the HAMMER AND CHISEL on the face (M); take the FOSSIL (purple).
Place the FOSSIL on the niche (N).
Play the HOP.
You receive the MONKEY NECKLACE (O).
Put the MONKEY NECKLACE on the statue (P).
Take the PIANO KEY (Q).
Walk down, turn left.