Question Coin
From the Super Mario Wiki
A Question Coin is a special Coin in Super Mario Galaxy and Super Mario Galaxy 2. When one is obtained one of the following occurs:
- A Mario theme will play and a line of musical notes will appear for Mario to collect, usually causing a 1-Up Mushroom to appear.
- An accumulation of Star Bits or Coins will appear for Mario to collect.
- A power-up will appear.
- Another question coin will appear
They appear in many stages, like Good Egg Galaxy.
