1-A (NSMB)

Down the pipe you will see an underwater world. Also, a ?-block with a power up can be found. At this point the screen will scroll automatically: that means Mario will be crushed by solid obstacles if he was hit with that at the most left of the screen.Sushis, a kind of blue shark appearing often will enter the screen with a fellow Sushi, charging straight ahead. So Mario is advised to steer clear of them or to let some fireballs take care of the problem, if he has the capability.

Head right through the multitudes of Sushis in this area, finding a P-Switch to hit to reveal silver Coins spread among the bouncy obstacles ahead, so swim precisely to get through the area quickly, grabbing all the Coins along the way. After this area send Mario swimming for the ceiling of the next stretch, as a Star Coin rests up here, and it is difficult to come at it from below due to the invisible blocks that populate the area. From there Mario will go right, entering the pipe leading upwards, appearing near the second Star Coin.

Upon entering the water area again, avoid the Cheep-Cheeps and hit the rotating Power-Ups for the picture that is on the block when Mario makes contact from below. Next up are Sushis attacking from the left, so dodge them and enter the Red Coin Ring to go try for the Power-Up/1-Up reward. The Sushis will now switch back to attacking from the right, but they are aided by air currents from pipes, so swim through the currents between waves of Sushis, finding a P-Switch to hit, revealing a multitude of silver Coins to grab, all the while dodging Sushi charges.

Swim right as soon as the Star Coin appears above, grabbing the Star Coin, followed by either ducking to avoid the incoming Sushi or swim back out quickly. Swim past the last few Sushis and head up the pipe, going forward to jump to the flagpole to end the level!