Super Mario Bros. 3/World 3

This is the Water World. There are lots of levels in this world as well as an optional Canoe Ride.

3-1
This is the first water level. You can use a Frog Suit to swim quickly.

3-2
This level has Cheep-Cheeps and elevators to stand on.

3-3
This level introduces the Boss Bass, a strong fish that will eat you and you'll lose a live even if you're Fire or Raccoon Mario.

Fortress
This fortress has no enemies not in the previous fortresses. However, there is a row of 9 doors. The fifth will lead you to a 1-Up. The sixth will take you to Boom Boom's room. This Boom Boom will fly after the first stomp.

3-4
This level is grassy, and it introduces a new enemy, Lakitu, who can drop Spinys at you.

3-5
Use a Frog Suit in this level. Only if you have a Frog Suit, you can enter a pipe with 3 1-Ups!

3-6
A side-scrolling level introducing Rotary Lifts.

3-7
This level introduces Spike. Break a brick with a Troopa shell and get a green vine. Go right and if you land on a group of clouds, get a pink block and jump high above it to get a Jugem Cloud.

Fortress
This fortress is just about all water except Boom Boom's room. It introduces Stretches. Boom Boom has new blocks in his room to make it harder.

3-8
This level has Boss Bass once again. You can get a visit to the White Mushroom House if you get 44 coins.

3-9
Bob-Ombs are in this level. After going down either of two pipes, enter the water of this level and go all the way to the left. Enter a pipe and get a Frog Suit!

Canoe Ride
If you have a hammer, you can break a rock and get a canoe ride to 2 Toad's Houses and 2 Spade Panels. However, there is also the option of saving the hammer for World 4.

Airship
This airship has the same enemies as the first 2, plus Rocket Engines, which blow from cannons that look just like Bullet Bill cannons. Wendy O. Koopa throws rings, and she must be stomped on 3 times just like the first two Koopas. After stomping on her, you can get her wand and get a message from Princess Toadstool and a music box.