Reach Score (RS) is a new mode in TM2-Stunts. On a RS map you have to reach a special score determined by the mapper in a minimum of time. There is no penalty of -50pts for respawning.
You dont need to pass all CP to validate your run, you can choose your stunting route in a strategic way. But you get -50pts for every CP. Your run will suddenly end, if you have Reached the Score. If you pass the finish line, it will only break your run and not validate it. Mostly the finish line is hidden to avoid useless anger.