1. First Purple Coin
Hop on the first Dash Back buttons you see and then jump on the platform behind you to get the first Purple Coin.
2. Second Purple Coin
While you’re on the upper platform, hop on the first undead Koopa to get enough boost to reach for the second Purple Coin.
3. Third Purple Coin
Continue moving forward and then jump to get the third Purple Coin. If you are not confident about the timing to get the third Purple Coin, make use of the Pause Button to wait until the flying flame balls are no longer around.
4. Fourth Purple Coin
Hop on the trio of Dash Back buttons to get on the platform behind you.
After that, latch onto the monkey bars to drop the upper platforms. After that, jump to the next platform to the right to get the fourth Purple Coin.
5. Fifth Purple Coin
As you move forward, latch onto the platform in the middle and then crawl up to get the fifth Purple Coin.