You’re locked in a small room.
Use the rug on the floor to find a COIN under it. Use the coin on the desk on the left with the blocked drawers to unscrew the back of the desk. Inside you’ll find a PEN KNIFE and a POTATO PEELER. Use the potato peeler on the green surface of the desk to uncover a code.
Use the painting on the wall to take it off and find a safe behind it. Because you know the code, you can use the safe to open it and get the KEY out. Use the pen knife on the wallpaper on the left of the painting. You can see a faint outline of a door but after removing the wallpaper with the knife you can see the keyhole. Use the key on the keyhole and you’re free to go.
Game source: A copy of the game was found here on the internet.