Sky Road: Zone 3
Red Star Ring 1: As soon as the enemies first begin appearing, keep an eye on the bottom of the screen. The first Red Star Ring is there, being closely guarded.
Red Star Ring 2: After dodging the rockets for the first time, you'll see several diamond-shaped clusters of rings. The final one contains the Red Star Ring.
Red Star Ring 3: After retrieving the second, four enemies will attack you from behind. The third Red Star Ring will be in the center of the screen, impossible to miss.
Red Star Ring 4: During the second rocket section, you'll come to a short break, where you'll see a line of rings with the Red Star Ring in the middle.
Red Star Ring 5: You'll find this one hovering between two massive rockets shortly before the level's boss.