Act 2 of Marble Garden Zone increases the complexity of the mechanical puzzles and introduces more dynamic environmental elements. You'll encounter more elaborate drilling sequences, moving walls, and a greater emphasis on precise platforming.

Key Features & Hazards:
- Swinging Platforms: Platforms that swing back and forth, requiring careful timing to jump on and off.
- Crushing Blocks: Large blocks that move together, threatening to crush you.
- Gravity Switches: Some areas will temporarily reverse gravity, changing the flow of the level.
Strategy:
This act demands patience and observation. Study the patterns of moving platforms and crushing blocks before attempting to pass. The Lightning Shield's double jump can help you recover from misjudged jumps or reach higher, safer paths. Tails' flight can once again bypass many of the most challenging sections, allowing for easier navigation and access to secrets. There are numerous hidden passages and ring bonuses, often found by exploring above and below the main path. The boss of this zone is Dr. Robotnik in a unique drilling machine.
Boss: Egg Mobile (Drill)
Dr. Robotnik's Marble Garden boss is a large drilling machine that moves across the screen, periodically dropping a drill into the ground to create a temporary platform. He is vulnerable when he is not drilling. Wait for him to drop his drill, then jump onto the drill and then jump again to hit Robotnik in his cockpit. Be careful not to get hit by the drill itself or fall into the pits it creates. Seven to eight hits will defeat him. After this, you'll proceed to Carnival Night Zone.