Speak to Elton; take the KEY (A).
Examine the door and use the KEY on the lock (B); enter the building.
Speak with Elton to trigger a HOP.
Examine the stall to access a HOP (C).
Play the HOP.
Find and use the items in the order numbered in the find list.
You will receive the AXE (D).
Examine the board and use the AXE on it (E).
Speak to Elton; take the map (F). The map will now be added to the bottom right above the hint button.
Speak to Penelope (G).
Examine the toolbox; take the MALLET AND CHISEL (H).
Examine the grate and use the MALLET AND CHISEL on it. Open the grate; take the PUZZLE PART 1/2 (I).
Take the BOARD (J).
Go right on the ledge (K).
Select anywhere in the scene and then place the BOARD on the gap (L).
Take the CANNONBALL (M).