Spinner

Spinners are a purple bat-like Badnik featured in several Sonic the Hedgehog titles. They first appear in Sonic Adventure.

Mario & Sonic at the London 2012 Olympic Games
In the Wii version of Mario & Sonic at the London 2012 Olympic Games, the Spinners appear as obstacles, and use their design from Sonic Colors.

Spinners make an appearance during a Bonus Game in London Party where the player has to count the number of robots flying around the screen. They also appear during the Dream Sprint event on BINGO Highway, where they can be found hovering in midair above the track. If a playable character runs into a Spinner, they lose speed. Spinners are also featured in the Dream Discus event in Windy Valley, where they float along the racing course for the event. If a character crashes into a Spinner, they become temporarily stunned. A character can destroy a Spinner by ramming into it with the Boost maneuver. In doing so, they earn five points.