Sonic R/Walkthrough

Coins, emeralds, and balloons are basic elements in every course. The final level Radiant Emerald is the only exception to this rule. This level lacks coins and emeralds.

Coins
Each course has five coins to collect. If you collect them all and finish 3rd or better, you will race against a secret character. The character will be unlocked if you win.

Emeralds
Each course has one or more Emeralds. To keep an Emerald you must finish the race in first place. Collect all seven to unlock Super Sonic.

Balloons
Each course has nine balloons to collect in two player mode. The first player to collect five wins.