Sonic 3D

You have to collect birds by killing monsters and returning them through a hoop.

Sonic 3D  Review

Sonic goes to visit his friends, the Flickies, on Flicky Island. He gets a surprise when he arrives, though. That evil Doctor Robotnik has surfaced again and is using the special location-warping powers of the Flickies in his never ending quest for the Chaos Emeralds. Turns out that the Flickies posses the power, when grouped in fives, to warp from location to location using ring portals. Sonic decides to free his friends from Robotnik and crush the madman's ambitions.