Sonic Blast/Green Hill Zone

Act 1
The first act of Green Hill Zone is a simple run to the right. There aside from the enemies, there is one hazard - a spinning spiked log to the right of the first loop.

When you reach the waterfall, you can either go through the water and jump on the platforms, or take the upper, faster route.

The large ring to the special stage is located in the pool under the waterfall. Jump in, and head all the way to the right, past the breakable blocks.

Act 3
Head to the right to challenge Dr. Robotnik. He will approach from the right in a helicopter, and release a boomerang. It will fly in a circular fashion before returning.

His craft is vulnerable at the windshield.