As Sonic, reach the last sequence when you hit the switch before you get the goal to launch the missile. Use the first switch then instead of using the second switch. Use the bounce attack to go higher to the red platform and move to your left. Hit the switch to go down. Step off the purple platform to find the switch. Use the bounce attack to get high enough to reach the gravity switch. Once you do, just jump to hit the switch. The next part is tricky. Use the homing attack to hit the spring near the goal and do not press anything. You should end up back where you started use the first switch to go up. Repeat the procedure, except use the switch that is straight ahead. When you get down, fire the missile to get the goal.

After you go through the door, you will see a gravity switch like all the others in the level. Flip it. You will then be upside down on a purple platform. Follow the path and kill the enemy using the Homing Attack. Keep going forward and you will see a switch that points left. Do not press it -- it is a trap. Instead, go to the rail and you should see a red platform. Jump off and you will land on it. Next, you will see one of those weird blue robots, except this one shoots in every direction. Use the Homing Attack and it will die. Do not go backwards and flip the switch. If you did go down, just jump on the boxes behind you to find a springboard. Jump onto this to go back to where you came into this part of the level. Next go left and flip the switch. You will be on top of the purple platform. Go backwards then right and you will reach the edge of the purple platform. You should see a blue and yellow platform. Jump to the yellow platform. Kill the blue robot and go to the right to get a green shield. Then, go back to the left and flip the switch. Go onto the springboard and hold Down. Follow the yellow path until you get to the red rail. There should be a springboard located here. Go onto it and you will grind the rail to the green platform. Follow the green path while avoiding the electric robots. Go onto the springboard and you will go to the purple platform. Go to the end of the path and you will see some rings. Use Light Dash and you will go to the blue platform. Get the rings and flip the switch. It will lead you to the purple platform. Follow the path and you will see the missile switch, and a gravity switch. Run into the missile switch and flip the gravity switch. It will bring you back to the red platform. Now you can flip the down switch and you will see a missile. Step on the button and the missile will get rid of the green stuff and the goal ring will be there.