Mega Man 9 may look like a NES game, but it has features from future Mega Man installments like collecting bolts. Bolts can be spent at Auto’s item shop to purchase items such as extra lives, energy tanks, and the invaluable Shock Step. Here’s a list of them from the top left to bottom right.
1up – Extra Life
Energy Tank – Used to refill Mega Man’s energy.
Mystery Tank – Used to refill Mega Man’s energy and weapon energy.
Fliptop/Eddie Call – Appears to give Mega Man a helpful item in a stage.
Beat Call – Lets Mega Man call Beat in to attack.
Energy Balancer – Automatically distributes weapon energy items to the most drained weapon.
Guard Up – Reduces damage by 50%.
Shock Step – Allows Mega Man to step on spikes and survive.
Costume – Lets Mega Man change into a new set of clothes, presumably Roll.
Hair Style Book – Gives Mega Man a fashionable look.
The description for the costume change item is abstract. Capcom doesn't say what costume Mega Man gets for 200 bolts. It just says Mega Man is going to show you his favorite clothes and there is a picture of Roll. The hair style book item on the Japanese page isn't explained either, but my best guess is spending 20 bolts lets you play the game as Mega Man without a helmet.
What's worth more to you an extra life or Mega Man minus his helmet?
Images courtesy of Capcom.