If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your mission, should you decide to accept it is to prevent Nip and Tuck from opening my safe. To trap them, you have to build a security system using the simple machine you have at hand.Click on the red button to open your toolbox. Click on the tools and drag them to the right place inside the machine. Close the toolbox and click the handle to startup the machine. Remember, Nip and Tuck are fast workers and might get the safe open before you drop the cage over them!