Windy Hill: Zone 4
Red Star Ring 1: Toward the beginning of the stage, you'll needed to jump over some thorny plants. At the end of the platform, you'll see a row of six jump pads needed to launch you to the next area. Don't use them. Instead, circle 180 degrees to the "ceiling" of the area, where you'll find another group of three jump pads situated above the first six. Use those to reach an animal cage. Use the next set of jump pads immediately in front of you and jump over a few charging sheep to find the first Red Star Ring.
Red Star Ring 2: During the side-scrolling segment, there's a hidden path beneath the three sunflowers, the entrance of which is blocked by a red sheep. The second Red Star Ring is suspended just over the exit.
Red Star Ring 3: When you reach the area with the waterfalls, you'll come to one with falling platforms in a row. Time your jumps carefully to reach the third in the sequence, where the Red Star Ring is located.
Red Star Ring 4: Midway through the level, you should see a power-up immediately in front of a set of steps. Take the power-up and climb the steps to find a loop. Use the power-up to open a portal in the center of the loop. In the room that you're teleported to, steer Sonic to the center of the room to crush the structure and unearth the Red Star Ring.
Red Star Ring 5: Just before you encounter the zone's boss, you'll pass a couple of windmills. The Red Star Ring is perched high above the first one you see. Jump up to one of the platforms on the top-right of the windmill, and use the momentum and a well-timed jump to launch yourself over the left side.