Sky Chase Zone

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Sky Chase Zone is the ninth zone in Sonic the Hedgehog 2 for the Sega Genesis; coming after Metropolis and before Wing Fortress Zone. It is the first of three consecutive single-Act zones that conclude the game.

Overview
This level serves as a relaxing interlude for the next stage, Wing Fortress Zone. Alternately, it could also be described as a general break in the heavy action of the previous couple of zones. It is generally viewed as much easier than the previous Metropolis Zone.

In this stage, the player that you are controlling (Sonic or Tails) will be standing on top of the wings of the Tornado bi-plane. The other character will be in the cockpit flying the plane. This is regardless of whether you selected to play with Sonic and Tails at the beginning of the game, or one of the two alone.It should be noted that this is one of zones that having 2players pays off as the frist player is on top and the secned player can fly the plane.

The goal is to get to the end of the level, which flows right into Wing Fortress Zone (the aerial juggernaut flying past the biplane at around the midpoint of this stage). With the level's automatic scroll, this will take at least 2 minutes and 6 seconds (depending on where you are standing when the plane automatically shoots forward into the next level). However, Dr. Robotnik is not going to let Sonic (or Tails) catch up to him without some resistance in the skies!

Enemies
Balkary

This is the first enemy in the level that you encounter. A robot that looks like a military fighter jet, if it had eyes and a beak. Reddish in color. At the beginning of the level, Balkary will come slowly, and one at a time. As the level continues on, they come in groups of three, and at much faster speeds. These can be vanquished with a bop to the head.

Nebula

The Nebula is the second type of badnik encountered in the level. It looks like a small egg with a small (but functional) propeller on its head. The overall result looks similar to one of those small hats with the plastic propeller on top. The first one of these robots in the level attacks alone, but most of the rest of the robots attack in groups of three (with the exception of the last group of seven). When they first see Sonic and Tails, they will rise up slightly in order to attack. From their bottoms, they can shoot spiked balls at Sonic and Tails. They can be defeated by stomping them on their heads, thus also avoiding the spiked balls.

Turtleoid

This robot is the third type of robot that you encounter in the level. The robot that sits on top of the shell does nothing besides control the shell. The shell can shoot one small projectile out of its mouth. This will not be an issue when there is one Turtleoid, but when multiple ones are on the screen, it can become an issue. To defeat the turtle bot, jump on the head of the robot controlling the shell. The shell cannot be destroyed. As a result of this, it can actually be used as a stepping stone if the player wishes to do so.

Other Features
Automatic Scroll

This level has an automatic scroll to the right, so it is possible that the level itself can crush Sonic/Tails if the player is not fast enough and gets trapped between the left side of the screen and another enemy. This is the first Sonic level on the Sega Genesis to contain an automatic scroll, but not the first Sonic level to have an automatic scroll (that dubious honour going to Act 2 of Bridge Zone in Sonic the Hedgehog for the Game Gear).

Boss

There is no boss in this level. Once the player reaches the end of the level, the next level (Wing Fortress Zone) begins with a bang when a huge cannon fires on the Tornado, forcing it to the ground and letting whoever the player is controlling at the time explore the warship on his own...