Pop a Koopa through the space between the blocks, then hit the shell in the air for 8,000 points.
Be sure to reveal the hidden vine from the right most block of the right elevated platform. Climb up to discover coin heaven C.
You'll drop to the top of the row of bricks above the pipe from the bonus area and avoid a tricky jump below, as well as find an opportunity to net yourself a 1-Up.
You can take the normal exit pipe to the level's end and move on to the next world, or continue to run along the ceiling and be taken to a Warp Zone that leads to the final world, World D.
Now that you've survived several underwater stages, you are familiar with the danger of Bloopers. This mid-air Blooper is not as menacing as its fishy buddies.
Beware of Sprite Limits! If there are five enemies on the screen before you approach the red spring, it won't show up. Instead, you will get trapped and run out of time.
Fortunately, if there are four enemies on the screen before you approach the red spring, there will be no red Parakoopa right after to disturb you.
If you hit the Spring just right, you'll have enough air to clear the top of the pole. Then you can move on to the Warp Zone Ahead.
The Fire-Bars will not scathe your character if you stand on the left edge of the "?" Block. Wait there, then grab the Power-Up when the timing is right.