Sky Chase Zone

Ninth zone in Sonic 2.

Robotnik has escaped to the sky! Sonic's a wing-walker (and Tails is his pilot) in a perilous battle above the clouds!

Nebula - Spherical enemy with a small propellor, drops a spiked ball on Sonic when he moves underneath it.
Balkiry - Bird enemy, flies horizontally at high speed.
Turtloid - Turtle enemy, fires small missiles at you. Once the little turtle is destroyed, the large turtle can be used as a platform.