just use the space bar.
main stages panel 1: sonic's about to go down a slope. simple. main stages panel 2: sonic running into a loop. special stages panel 1: special stages will use raycaster 3d. sonic is about to jump off a platform. special stages panel 2:sonic running down 3d slope. this is inspired by the japanese sonic gameplay concept art. the ones where sonic is just a stickhog.