1. First Black Coin
The first Black Coin won’t be as obvious at first. You will have to pass through the other coins to reveal the first Black Coin, which is right on top of the first platform in the middle and right behind a Boo. After making a pass that will help reveal the first Black Coin, jump on to the adjacent platform to the right, jump over the green door so you won’t enter it. Once you’ve made your way to the other side jump over the green door again and allow yourself to fall to the first middle platform again and making sure to get by the first Black Coin.
After taking the first Black Coin, enter the first Green Door on the left side of the screen.
2. Second Black Coin
To reveal the second Black Coin you will first have to pass through the first Red Ring, which is situated right in the middle of the screen. All you have to do is make your way up there by jumping on the boxes and not entering a single door.
Once the second Black Coin is there, just do the same thing and getting the Black Coin.
3. Third Black Coin
The third Black Coin won’t involve any kind of special tricks to get it. All you have to do is hop on to the higher boxes located at the top most area and then jump to claim the third Black Coin, which is right in the middle of a sea of Gold Coins.
After taking the third Black Coin, go down and enter the first green door on the left side of the screen.
Then upon exiting the next room, enter the green door that’s in the upper middle part of the screen.
4. Fourth Black Coin
The fourth Black Coin will require your patience and strategy (as always). Luckily there is a Pause Block on the ledge right before the area where the fourth Black Coin is located.
Waiting for the right time to jump to get the fourth Black Coin is important since a Boo is patrolling the area. Jump as soon as the Boo disappears and once you’ve latched on to the bars, hurry on the get the fourth Black Coin.
5. Fifth Black Coin
For the fifth Black Coin, all you have to do is make your way to the top and latch on the bars to reveal the invisible row of coins above. One of those coins will be the fifth Black Coin. Once the fifth Black Coin is available, all you have to do is get down and make your way up again the row of coins above to get the fifth Black Coin.
Make sure to get the fifth Black Coin just before the Boo touches you. After that, enter the green door to exit the room and complete the level.