Choco-Ghost House

Go right, jump over the moving gap and the two ghosts.

Proceed right, up a platform, then down to face a pack of ghosts and a moving platform.

Go left back to the platform to dodge the ghosts, then move forward over the moving gap.

Pass more ghosts and another moving gap, then ascend to a higher level.

Be cautious of a ghost on a cloud above; avoid touching the flame on its fishing rod.

Head right over and up sets of stairs to a high and low platform with a ? block. Take the lower route to avoid ghosts above and hit the ? block for a powerup.

Continue right over moving gaps and past flying ghosts until you reach the door to the next area. Enter it.

You will encounter a new type of Boo that appears as blocks when you look at them, allowing safe jumps. When you turn away, they become Boos and will chase you.

Go right, where three Block-Boos are ahead. You can use them to reach the ? block above (containing a powerup) or jump past them.

Go under the wall and dodge the moving line of Boos, then proceed right.

At the top of the screen is a door you must enter. If you have a cape, ensure no lines of ghosts are present and fly up to the ledge.

If you are not caped, continue right to the end to find three Block-Boos and a block with a 1-Up Green Mushroom.

Lure these Block-Boos back to the door's location and use them as platforms to reach the ledge above and enter the door to the exit.