? Coin

A '''? Coin (or Question Coin), is a type of coin found in Super Mario Galaxy' and Super Mario Galaxy 2. These type of coins are found in multiple galaxies, but the ? coin can trigger many things when collected by Mario (or Luigi).

The ? Coin can cause any of the following things to happen: When Mario collects a ? Coin, most of these options are given a time limit for Mario. If he is done successfully, then Mario will receive a prize. It is usually a 1-Up Mushroom or three of them, a power-up, coins or star bits, or a Rainbow Star rarely.
 * A trail of Rainbow Notes.
 * It can make Coins and Star Bits appear in big amounts.
 * A power-up can appear.
 * Another ? Coin could appear.
 * A Life Mushroom.
 * 1 or more 1-Up Mushrooms appear.
 * A Rainbow Star.
 * A Sling Star.