Turn on the volume before starting the project. Enter full screen before starting project. You might have to play the project a few times for it to work correctly.
Credits go to @panspancakes and the Flash tv show. Please follow my studios @Marvel & DC as One! and @Quicksilver VS The Flash Panspancakes is founded at https://scratch.mit.edu/users/panspancakes/ The Marvel studio is founded at https://scratch.mit.edu/studios/5503732/ The Flash studio is founded at https://scratch.mit.edu/studios/3665559/