This construction doesn't vary much from act to act, rather than change layout, the goal ring simple moves onto a higher up floor, allowing new sections of the tower to be played the higher the act you go. Be prepared to be thrown about by many a spring (hello Sonic Crackers), and be sure to check out any fishy looking Dr. Robotnik walls, they're generally hiding goodies or Special Stage entrances behind.
At the top of the Tower, Dr. Robotnik attempts to be rid of you in this circular looking robot, with extending arms, while firing lasers that rebound across the arena thanks to some moving mirrors. Aim for the big red area in the middle of the robot.
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