Collecting rings during a race allows you to upgrade your "Extreme Gear" (hoverboards, bikes, etc.) in real-time.
There is no legal digital download provided by SEGA for this game. sonic riders zero gravity download
The most common way to play on PC is using the Dolphin Emulator. This allows you to run the Wii version of the game in high definition, often with better performance than the original hardware. Collecting rings during a race allows you to