1. First Purple Coin
For the first Purple Coin, you will have to reveal the single coin right on top of the first Surprise Question block. Pass through it first to make the Purple Coin available.
Once that is done, hope onto the first Surprise Question block and get the first Purple Coin.
After getting this coin, enter the green door in the middle.
2. Second Purple Coin
For the next coin, make sure that you’ve entered the green door in the middle. Upon exiting hop on the springboard to your right and then pass through the right side to let you go out to the left side. Then, hop on the nearby springboard to reveal another column of coins—the second Purple Coin will be part of them.
To get the second coin, make sure not to enter any other door just yet. But once you’ve taken the second Purple Coin, enter the green door located at the upper left corner of the screen.
3. Third Purple Coin
After getting the second Purple Coin, jump on the upper most platform to the right and then jump under the brick right beside a Surprise Question Block to get the third Purple Coin.
4. Fourth Purple Coin
Upon exiting the green door you’ve just entered, hop on the spring board to let you hang on to the ceiling. Make a pass through the coins to reveal the third Purple Coin then make another pass to claim the third Purple Coin.
4. Fifth Purple Coin
Once you got the third Purple Coin, make a jump to release and fall down. Get on the row of coins located just below the door in the middle. Pass through it to reveal the next Purple Coin and then make another pass to get the coin.