1. First Black Coin
To get the first Black Coin, continue making your way up. Once you see a two green platforms, you will find the first Black coin sitting right in the middle of a few bricks. You may have difficulty getting through since there will be a brick wall separating the two green platforms.
To be able to pass through, go up and hit the P switch button to convert the column of bricks into a column of Gold Coins. After that, hurry on back down to the first Black Coin before the Gold Coins turn into bricks again.
2. Second Black Coin
Getting the Second Black Coin, will entail completing a few tricks first. Continue making your way up and then when you find two blue platforms, jump under the brick on top of the blue platform on the right to reveal the P switch.
When the P Switch is revealed, quickly hop on the new bricks that were formed above in order to make it to a pipe on the right where the second Black Coin is resting.
3. Third Black Coin
Keep going up until you find the row of moving saw blades. Just keep climbing up until you find a Black Coin amongst the row of moving saw blades.
Note: After getting the third Black Coin, be sure to hit the Time block just above to help you buy some time for the whole stage.
4. Fourth Black Coin
Continue moving up. Then when you see saw blades moving in a square. In a corner on the left, you will find the fourth Black Coin.
5. Fifth Black Coin
Get the mushroom that’s sliding back and forth under a block of bricks. Then move up where there’s a green door that has the fifth Black Coin with Gold Coins encircled around. From the right bounce to the column of spikes (you will shrink after hitting the spike) and bounce back to the wall and back into the circle in the middle to get the fifth and last Black Coin.