Sonic Mania Blue Sphere #15 Gold Medal

Immediately go for the 4x4. Go upwards and take out the 3 small sets of spheres to the spring bounce. Carefully take out the 2 3x3s and grab the 5 rings afterwards.

Go through a few spheres and you'll come across a + of spheres and at the end rings. go through one way and grab the rings then get the other 2, making sure you jump over the middle one. Go through a few more and go through a slightly longer + and grab the spheres and rings, making sure you avoid any red ones.

After the small set of spheres and spring bounce, be prepared for a large plus sign of spheres. Make your way down and do another long + and avoid the red spheres and grab the rings.

Next, grab all of the outside rings before taking care of the large plus sign. Then grab a sphere and be done.