Super US Coin Puzzle

Stack adjacent coins of the same amount.
When the total amount of the stacked coins is the same as the coin more worth, the coins will be exchanged.
*If the total amount exceeds the amount of the coin more worth, the coins will not be exchanged.
- 1¢ x 5 = 5¢
- 5¢ x 2 = 10¢
- 10¢ x 5 = 50¢
- 50¢ x 2 = $1
When you stack 5 $1 coins, they will go into the piggy bank automatically.
The game is cleared when the specified number of $1 coins are put in the piggy bank.
To buy(remove) a sweet, merge it and the coins which is equal to or more worth than its price.
The game is over when any coins cannot be moved or time is up.

Rules