World 3-1 (Super Mario Bros. 3)

World 3-1 is the first level of Water Land in Super Mario Bros. 3, unlocked by clearing and its own completion unlocks World 3-2.

Layout
The level begins in an underwater area with Bloobers and pipes producing current, and falling through the chasm to the left will bring the player to a power-up. To the left of the first set of pipes and sinking downward, the player will pass a few more Bloobers and two Lava Lotuses before swimming back upward, though the player can also jump over the pipe above the water to reach a hidden power-up. The next area splits into an upper and lower section, with the upper section having a Bloober with kids and the lower having many Jump Blocks that can bounce the player around near a Lava Lotus before reaching a 1-Up Mushroom surrounded by coins. One last Bloober waits before the Warp Pipe leading to the goal.

Level statistics

 * Power-ups: 3 (Super Mushrooms or Fire Flowers)
 * 1-Up Mushrooms: 1
 * Secret areas: 0