This is a game about solving puzzles and hunting for clues to find hidden ninjas. Use your mouse to click and interact with the environment. Use your left mouse button to click on doorways and ladders in order to use them. You can interact with almost everything in the game- the environment is absolutely full of clues that you will need to find if you want to have any hope of solving the puzzles and finding all of the ninjas. Of course, some of them are less hidden than others and will poke their heads in to check on you.