Enter the amount of time in seconds when asked (use plain numbers from 15-600, otherwise the game will break) [Typing in UNLIMITED will remove the time limit] After that, control the clear and fail sounds using the arrows before clicking the tick button During the countdown, press the clear and fail buttons to stop the timer and play the sounds
This is really meant for courses that already have a timer on, and if you need to time your course runs to the exact second (although Scratch's timer can be a bit off sometimes)