You’re in a toilet and you need to steal the jewels without the guard seeing you. Pick up the PLUNGER and the BUCKET. Open the door and step outside but don’t walk too far to the right otherwise the security camera will spot you. Use the plunger on the security camara over the door.
Now that the way is clear you can use the elevator to go downstairs. Step outside and walk to the left but don’t go past the wall otherwise the guard will notice you. Use the pole and the bucket together and the guard isn’t an issue anymore. Walk over to the crystal case and use your ninja star to cut a hole in the case. You can take the diamonds and leave. Just look out for….
Game source: A copy of the game was found here on the internet.