If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this game you need to sneak out of the office without being busted. You need to get past the secretary and the rest of the staff. You'll see lighter cones that will represent the view area of the people. You must not step on these cones. Get to the exit door of every room to pass the level.
Use Arrow Keys to interact.