-Take the TOY CHEST KEY on the window sill.
-Open the toy chest. Take the KID'S ROOM KEY.
-Open the door and go to the room next to yours. Open the bottom drawer and take the FRONT DOOR KEY.
-Open the box in the living room next to the TV. Take the BACKYARD KEY.

-Open the glass sliding door and enter the backyard. One of the pots has an OFFICE KEY inside. Take it.-Open the locked door on the 2nd floor. Enter the office. Open the Hidden Key book. Take the SHED KEY.
-Open the front door. Next to the telephone booth there's a sewer lid. Move it and jump down. Go straight till you see a skull. Take the TOOLBOX KEY out of its eye socket.
-Take the plank behind the skull. Carry it to the hole nearby. Place it over the abyss.
-Take the ladder. Carry it all the way back to the sewer entrance. Place it there.
-Open the shed in the backyard. Open the toolbox under the table. Take the PANTRY KEY.
-Open the pantry (across the stairs). Take the CAR KEY out of the left box. Take the TREEHOUSE KEY #1 out of a jar on the very top shelf.
-Open the car. There's a DRAWER KEY inside the glove compartment. Take it.
-Open the top table drawer in the office. Take the TREEHOUSE KEY #2.
-Go to the backyard. Move the ladder to the treehouse. Open the box inside. Take the BRIEFCASE KEY.
-Open the briefcase in the office. Take the PRISON CELL KEY.
-Go to the sewer and open the prison cell.
-Examine the Teddy Bear.