okay on Scooby-Doo Cyber Chase ive got to the level Arcade and i've found all three of the magna bars and took them to the machine in the attic but i cant find out what to do after i find the three of them is there one more i have to find or what? i think im supposed to find one more anyway but i cant figure it out. so please help me if u can. id reall apperciate it. what do i do?