You have to locate the intruder by listening to all the sound by clicking on the object/animal and decide which sound is wrong. - Press 'h' if you think it's the Horse. - Press 'down arrow key' if you think it's the T-Rex. - Press 'left arrow key' if you think it's the Referee. - Press 'd' if you think it's the Drums. - Press 'c' if you think it's the Cat. - Press 'b' if you think it's the Bear. - Press 'right arrow key' if you think it's the Duck. - Press 'up arrow key if you think it's the Balloon. - Press 'r' if you think it's the Rooster.