The Spring Stadium Zone Boss involves Robotnik's Eggmobile with 2 long arms and spiked ends. The boss will hover above you for a bit, then will hover near the ground slamming it with his spiked arms. To hurt him, you need to hit him from behind when he is low near the ground. As you hurt him, he will speed up and come to the ground more often. There are springs in the upper area of the arena to dodge Robotnik if he gets too close. Also note that there are spiked floors surrounding the arena and in the very center. You can use the spring to get to the spiked floor at the side of the arena. The boss can't hurt you when you're there. Keep jumping to avoid the spikes and hit the boss when it gets close.