[[File:SMB3-Level3_labeled.png|frame|right|White House: World 3-8, 44 coins, [[File:SMB3 item PWing.png|18px]]]]
World 3 is called Ocean Side. The levels you find here are primarily water themed, which makes the Frog Suit ideal for many (but not all) of the levels. This world is much longer than the previous ones were, with nine levels and two fortresses.
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The map contains multiple pipes. They have been colored here, pipes with the same color connect together. Another feature of this map is the bridges - they go up and down when you beat a level, and you can only cross them when they're down.
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| <font color="blue">'''B'''</font>
There are two Hammer Bros. here. Note that if the Hammer Bro is standing on the water on the world map, there will be a bit of water in the fight, which is a problem if you're small Mario. One awards a starman, the other awards a Hammer. Using the hammer on the rock next to 3-5 allows access to the canoe. You can use the canoe to sail to two remote islands, they consist of some mushroom houses and spade panels.
Moving from the dry desert to the bottom of the sea, Mario is in for quite a change in scenery. You'll have to imitate an amphibian to survive your aquatic adventure. It can't get any wetter than this!
The mushroom house at the top left has only a Frog Suit. The other ones still have the traditional three-way choice, but, except for the one on the top-right island, have foregone the Super Mushroom in favor of the Frog Suit.
You'll earn a second Hammer item from a Hammer Bros. and you may wish to use it on the rock to the right of World 3-5. Doing so will give you access to a canoe that you can row around the world. Two docks let you visit remote islands that contain Toad Houses, which offer free items for your inventory, as well as two chances at bonus lives.{{-}}
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==3-1==
==World 3-1==
{{Scrolling map|SMB3-3-1.png{{!}}1289px}}
Exploring the bottom of the sea can be dangerous. Take a deep breath—you'll need it. Ocean Side is one tough world. The critters in the sea are mean, lean and hungry! Since water is the primary element in this world, the Frog Suit or Firepower is the recommended choice of gear.{{-}}
*If you got the Frog Suit from the secret mushroom house in World 2, this is the ideal level to use it in. If you didn't, drop down at the very beginning to find a block with a Fire Flower.
{{Scrolling map|SMB3 W3 S1 a.png}}
*Many of the pipes here have water currents which push you away from the pipe (these are marked on the map). Unless you have the Frog Suit, you cannot swim against the current.
{{sidebar|float=right|width=250px|title=Increase your chances of collecting 5-Up!|contents=You get 5-Up for three Star Cards. To collect a Star Card at the end of every world, run towards the goal while holding down {{nes|B}}, and jump at the card at a 45 degree angle.}}
*The first enemy you'll encounter here is a Blooper. It just swims around in an attempt to hit you. Unless you are Fire Mario, you cannot hurt it, so just avoid it.
* '''1''': Immediately after you enter the stage, sink down to reach a hidden nook with a '''?''' Block holding a power-up. You should always collect power ups because they're worth 1000 points.
*If you're not Frog Mario, at the part where the path goes down, swim to the surface and jump out of the water. Run over the wooden structure to get to a small hole where you can find another Fire Flower.
* '''2''': Powerful currents jet out of the pipes, so take care not to get pushed out of control and into enemies lurking nearby. Swim through it as quickly as possible. Be mindful of the Bloopers—they are a constant underwater hazard. Swim with care when you see one.
*If you chose to go down, you'll soon encounter a Lava Lotus. These spit out small fireballs that move slowly and hurt you. Quickly swim past to avoid them. Above the second Lava Lotus, the left block contains a Fire Flower.
{{Scrolling map|SMB3 W3 S1 b.png}}
*After the gray structure, drop down to come into an area full of note blocks that push you around. At the end, you'll find a brick block with a 1-up mushroom inside. It will soon fall into the pit below though if you don't collect it fast enough.
* '''3''': By jumping at the water's surface, you can get on top of this island. Jump over the green pipe and walk along the wooden ceiling to find a secret area containing a power-up. Use the Fire Flower to gun down any troublesome Bloopers that swim your path.
*The pipe at the top right takes you to the ending area which is empty apart from the goal card.
* '''4''': Be careful not to get bounced around like a pinball on the Jump Blocks, or the Lava Lotus will burn you.
* '''5''': Bump the '''?''' Block to reveal a 1-Up, and collect it before it's lost down the unfathomable depths.
==3-2==
* '''6''': Catch a ride on the current up to the tube—it leads to the end of the stage. A Blooper lies in wait to ambush you, but the current will carry you past this Blooper at high speeds. Watch out and go for the goal.{{-}}
{{Scrolling map|SMB3-3-2.png{{!}}1425px}}
*In this level you'll encounter donut blocks. These blocks fall down if you stand too long on them, so watch your step.
*The first block contains a Fire Flower.
*Jump onto the wooden platform, and as soon as you see the wooden blocks, bump into them from the side to reveal a starman, which helps a lot against the Cheep-Cheep jumping out of the water.
*The blocks on the way contain continuous starmen. "Continuous" means that they'll only be starmen if you're still invincible by the time you bump into the block (otherwise, it will be just a single coin).
*When you see brick blocks over your head, jump to the third one from the left to reveal a P-Switch. This turns the coins below into brick blocks, get to them then jump to the left of the coin overhead to reveal a hidden 1-up mushroom. You can then jump to the pipe when the Piranha Plant is inside.
*Behind the pipe there's a block with a Fire Flower. You need to fall into the water to get it.
*The pipe takes you to the ending area. If you're Raccoon Mario, fly straight up to find a wooden platform moving around in circles. Stand on the left tip and jump when it's at the very left to reveal another 1-up mushroom.
==3-3==
{{Scrolling map|SMB3-3-3.png{{!}}1922px}}
*The terrain in this level moves up and down constantly. In the water, there's a Boss Bass, which will try to eat you if you're too close to the surface, which means instant death. While you can kill him, he will just regenerate, so it doesn't help a lot.
*Jump onto the first note block to make a Fire Flower fall down. To get it, stomp on the Koopa Troopa and kick its shell against the brick blocks to the left. You can then reveal a P-Switch which will allow you to get the Fire Flower.
*In this level, you'll see red lifts that spin around. Watch out to not fall into the water.
*The brick block in the air contains another Fire Flower. Beside it there are ice blocks, which you can kick around like Koopa shells. Use it on the brick block at the ground to reveal a P-Switch, jump on it to make the coins ahead form a bridge to the pipe.
*Way past the pipe, there's an isolated platform with a 1-up mushroom. You can either fly there as Raccoon Mario, or try to swim over there (extremely hard).
*The pipe leads to the ending area, which is empty apart from the goal card.
*First, pass the two Roto-Discs and the Dry Bones by jumping over them.
*This place is a small maze. Most of the doors just take you to a moat filled with Cheep-Cheep. If you want to see the miniboss, run forward and take the sixth door. This leads to part 2.
*Taking the fifth door also leads into the moat, but on a platform where you can grab a 1-up mushroom.
*Go all the way to the back and enter the last door to get to a bonus area (see below).
*If you took any of the other doors, you'll fall into the moat. Take any of the pipes, they all lead back to the same pipe at the beginning. The blocks here contain raccoon leaves.
*If you took door six, you'll land at the top left platform, at the bottom door. Jump up to the top door and enter it to get to part 3.
*Run forward to meet Boom-Boom. This time, he has a new trick up his sleeve: once you stomp him once, he starts getting airborne. You must then wait until he swoops down on you to stomp him. Of course, you could just as well enter as Fire Mario and feed him five fireballs to avoid this.
*You'll see a bunch of coins, but the obvious way through the holes reveals hidden blocks which block you off. Jump from the door, though, to discover another hidden block which allows you to go up to the coins to collect them.
==3-4==
{{Scrolling map|SMB3-3-4.png{{!}}1664px}}
*The first block you see contains a raccoon leaf.
*At the big slope, you can slide down to kill the Goombas, but watch out because the slide leads right into a pool with a Cheep-Cheep inside.
*From this pool, there might seem to be no way to go further, but jump along the right side to reveal hidden blocks which lead you out.
*On the next slope, you might want to not slide but instead to stomp one of the Koopa Troopas and take its shell. Use it to take out the red Para-Goomba in the next area, which can be a pain.
*Once you see a Piranha Plant overhead, jump at the block directly to its right for a Fire Flower. Jump at the right brick block for a P-Switch, which will make coins appear in this area.
*Continue to see another new enemy: Lakitu. He drops spinies at you from above, run quick to avoid these. Right where you see him, jump at the second brick block from the left for a 1-up mushroom.
*At the end, jump at the last block for another raccoon leaf. At the goal card, you can try waiting until Lakitu drops four spinies, then collecting the card for a free 1-up.
==3-5==
{{Scrolling map|SMB3-3-5.png{{!}}1418px}}
*As Raccoon Mario, start flying from the pipe to land on a platform made of wooden blocks. Wag your tail against the brick block here for some coins, then resume flying to land on another such platform. Again get some coins from the brick block, then jump into the water and you will have skipped most of the level.
*The Frog Suit is of great advantage here. There are Jelectros in this level which are stationary enemies that hurt, and if you don't have the Frog Suit they can be rather annoying.
*Drop down to find a new enemy, a Big Bertha. This one will not try to eat you unlike its surface brethren, but instead release small children from its mouth. The first block above it contains a Fire Flower, which you can use to kill it.
*If you have the Frog Suit, keep at the bottom. Swim into the second pipe at the ground to get to a bonus area (see below)
*After the large pit there's another group of blocks, the middle one contains another Fire Flower. Just after the gray structures, you can find a hidden 1-up mushroom (which is difficult to collect without the Frog Suit).
*At the part with the two pipes and the group of Jelectros, you may want to lure the blooper ahead a bit away, otherwise it may hurt you while you try to swim up.
*The pipe at the end leads to the ending area. Jump on the wooden platform and from here, run to get the goal card.
===Bonus area===
{{Scrolling map|SMB3-3-5-bonus.png{{!}}128px}}
*Hold to the right to get to a giant ? block, jump at it to get three 1-up mushrooms! Afterwards, exit the area, you'll return at the part with the group of Jelectros.
==3-6==
A side-scrolling level introducing Rotary Lifts. The first ? block contains a fire flower, which you probably shouldn't get if you're Raccoon Mario. Be very careful when getting to the pipe at the end leading to the Goal Panel.
==3-7==
==World 3-2==
This level introduces Spike. Break a brick with a Troopa shell and get a green vine. Going to the left will lead you to coins and a P-switch. Then, go back to the vine. Go right and if you land on a group of clouds, get a beige block and jump high above it to get to a coin heaven containing a Jugem Cloud.
Leap quickly from platform to platform. Just don't fall in the drink. Those pesky flying fish, the Cheep-Cheeps, are back and more bothersome than ever! It's best to use firepower to fry them, but you can also stomp them.{{-}}
{{Scrolling map|SMB3 W3 S2 a.png}}
* '''1''': Cheep-Cheeps, always trying to take a cheap shot, will jump up at you from the water. Try fireballing them.
* '''2''': The hollow blocks on this stage will hold you weight for only a moment before they flicker and fall. Don't dawdle!
* '''3''': It's tough but possible to be invincible for most of the stage by grabbing three Starmen in a row. You'll need to get the first Starman hidden in a Wood Block and remain invincible to make the second one appear in a '''?''' Block. The final Starman, hidden in another '''?''' Block, won't appear unless you're still invincible by the time you reach it.
[[File:SMB3 W3 S2 c.png|right]]
{{Scrolling map|SMB3 W3 S2 b.png}}
* '''4''': Hit the Switch Block to change the coins into blocks, creating a platform to stand on that will allow you to collect a 1-Up from an invisible block.
* '''5''': If you don't have the Raccoon Suit, and you think you can snatch it without getting nibbled by the Cheep-Cheeps, go for the power-up in the water beneath the pipe. Then use the pipe to reach the exit area (shown right).
* '''6''': Before you exit the stage, use the Raccoon Suit to fly up to a hidden area overhead to score a few extra coins and a secret 1-Up.{{-}}
==Fortress==
==World 3-3==
This fortress is just about all water except Boom Boom's room. Start it by entering the pipe. This room has Cheep-Cheeps and Rotodiscs. After the pipe at the end of this room, the next one has Stretches, a Boo Diddly inside a bar. Boom Boom has new blocks in his room to make it harder.
Boss Bass: he's Big, he's bad, and he's hungry. Try not to become his next meal. You'll probably dislike him. He can swallow you whole even if you're fully powered-up! Plus, the land in this world rises and sinks, putting you right within his reach.{{-}}
{{Scrolling map|SMB3 W3 S3 a.png}}
* '''1''': This stage is a lot easier to complete as Fiery Mario—you'll be able simply to shoot Boss Bass out of the water.
* '''2''': Use the nearby Koopa to reveal the Switch Block. Stomp the Switch Block to convert the blocks into a sea of coins. Try to grab the Fire Flower from the Jump Block, but beware of Boss Bass.
* '''3''': Use an Ice Block to make another helpful Switch Block appear. Pound the Switch Block to create a bridge across the waters patrolled by Boss Bass. Boogie across the bridge (holding {{nes|B}} as you run) and Boss Bass won't be able to catch you. You'll have to hurry though, the bridge won't last long.
{{Scrolling map|SMB3 W3 S3 b.png}}
* '''4''': Time your jump onto the Rotary Lift so that you land just as it finishes a spin. That way, you'll have time to jump off. The pipe just beyond leads to the exit.
* '''5''': If you're feeling brave, a lonely 1-Up sits far past the pipe leading to the exit. You'll put yourself in danger trying to get it if you don't remove Boss Bass with a fireball first, but it could be worth it.{{-}}
==3-8==
==World 3 1st Fortress==
This level has Boss Bass once again. There are several Vines you can use to avoid getting eaten. You can get a visit to the White Mushroom House if you get 44 coins.
Doors, Thwomp Traps, Boo Diddlys and a flooded basement stand between you and BOOM-BOOM. This is a complicated fortress! The doors in the fortress lead to a flooded "back" stage. Most of the doors will just waste your time if you take them, so follow the map carefully.
==3-9==
===Front side===
Bob-Ombs are in this level. There are two ways to get to the water part; either enter the pipe in the middle with Raccoon Mario or enter the pipe at the end covered by ice blocks. After going down either of these, enter the water of this level and go all the way to the left. Enter a pipe and get a Frog Suit! After exiting the room, go right and follow until the final pipe. Enter it and you've reached the Goal Panel.
{{Scrolling map|SMB3 W3 F1 a.png}}
* '''1''': It's difficult to do, but you can warp directly to BOOM-BOOM by entering the third door, then repeatedly tapping {{nes|Up|Dpad}} as fast as you can.
{{Scrolling map|SMB3 W3 F1 b.png}}
* '''2''': You'll face a double threat near the Thwomp Trap. In addition to having to avoid the dangerous Thwomp Trap, you'll need to outsmart both Boo Diddlys. Be sure to give both ghosts a look as you wait for Thwomp to reset, or one of them will get you. Watch your back and don't let Boo sneak up on you!
[[File:SMB3 W3 F1 d.png|right]]
* '''3''': An easy 1-Up is what awaits you if you take this door. Hit the '''?''' Block so the 1-Up falls to the right.
* '''4''': Take this door to BOOM-BOOM. If you're in a hurry to get through the Fortress, head for this door and climb up the steps to the left to go straight to BOOM-BOOM's room.
* '''5''': Enter the very last door to gain access to a coin vault (shown right). Jump above the door where you come out to reveal an invisible block that will allow you to hop up and a little to the right to get to another block right next to the wall. this will let you get into the area containing the coins. Simply leap out once you've grabbed the loot.
(Variant: In Super Mario All-Stars, the ice block locations were changed slightly to prevent a glitch in which Mario can go down the side of the pipe.)
===Back side===
{{Scrolling map|SMB3 W3 F1 c.png}}
* '''6''': Falling from a door into the flooded basement isn't so bad—going back and forth between the Front and Back of this stage will reset the '''?''' Blocks in the Back Stage, you so can collect them again. The power-ups in the bowels of the fortress will make bringing down BOOM-BOOM much easier.
==Canoe Ride==
===Boss room===
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. There is also another toad house if you continue right.
{{Scrolling map|SMB3 W3 F1 e.png}}
* '''B''': You'll face an extra aggressive BOOM-BOOM at the end of this fortress. This BOOM-BOOM can fly! You'd better stomp this guy three times as fast as you can, otherwise he'll sprout wings and fly about the room. Then he's ''really'' tough to defeat.
==Airship==
{{Footer Nav|game=Super Mario Bros. 3|prevpage=World 2 Part 2|nextpage=World 3 Part 2}}
The king has been transformed into a Spike. 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.
{{Footer Nav|game=Super Mario Bros. 3|prevpage=World 2|nextpage=World 4}}
Moving from the dry desert to the bottom of the sea, Mario is in for quite a change in scenery. You'll have to imitate an amphibian to survive your aquatic adventure. It can't get any wetter than this!
You'll earn a second Hammer item from a Hammer Bros. and you may wish to use it on the rock to the right of World 3-5. Doing so will give you access to a canoe that you can row around the world. Two docks let you visit remote islands that contain Toad Houses, which offer free items for your inventory, as well as two chances at bonus lives.
Exploring the bottom of the sea can be dangerous. Take a deep breath—you'll need it. Ocean Side is one tough world. The critters in the sea are mean, lean and hungry! Since water is the primary element in this world, the Frog Suit or Firepower is the recommended choice of gear.
Increase your chances of collecting 5-Up!
You get 5-Up for three Star Cards. To collect a Star Card at the end of every world, run towards the goal while holding down , and jump at the card at a 45 degree angle.
1: Immediately after you enter the stage, sink down to reach a hidden nook with a ? Block holding a power-up. You should always collect power ups because they're worth 1000 points.
2: Powerful currents jet out of the pipes, so take care not to get pushed out of control and into enemies lurking nearby. Swim through it as quickly as possible. Be mindful of the Bloopers—they are a constant underwater hazard. Swim with care when you see one.
3: By jumping at the water's surface, you can get on top of this island. Jump over the green pipe and walk along the wooden ceiling to find a secret area containing a power-up. Use the Fire Flower to gun down any troublesome Bloopers that swim your path.
4: Be careful not to get bounced around like a pinball on the Jump Blocks, or the Lava Lotus will burn you.
5: Bump the ? Block to reveal a 1-Up, and collect it before it's lost down the unfathomable depths.
6: Catch a ride on the current up to the tube—it leads to the end of the stage. A Blooper lies in wait to ambush you, but the current will carry you past this Blooper at high speeds. Watch out and go for the goal.
Leap quickly from platform to platform. Just don't fall in the drink. Those pesky flying fish, the Cheep-Cheeps, are back and more bothersome than ever! It's best to use firepower to fry them, but you can also stomp them.
1: Cheep-Cheeps, always trying to take a cheap shot, will jump up at you from the water. Try fireballing them.
2: The hollow blocks on this stage will hold you weight for only a moment before they flicker and fall. Don't dawdle!
3: It's tough but possible to be invincible for most of the stage by grabbing three Starmen in a row. You'll need to get the first Starman hidden in a Wood Block and remain invincible to make the second one appear in a ? Block. The final Starman, hidden in another ? Block, won't appear unless you're still invincible by the time you reach it.
4: Hit the Switch Block to change the coins into blocks, creating a platform to stand on that will allow you to collect a 1-Up from an invisible block.
5: If you don't have the Raccoon Suit, and you think you can snatch it without getting nibbled by the Cheep-Cheeps, go for the power-up in the water beneath the pipe. Then use the pipe to reach the exit area (shown right).
6: Before you exit the stage, use the Raccoon Suit to fly up to a hidden area overhead to score a few extra coins and a secret 1-Up.
Boss Bass: he's Big, he's bad, and he's hungry. Try not to become his next meal. You'll probably dislike him. He can swallow you whole even if you're fully powered-up! Plus, the land in this world rises and sinks, putting you right within his reach.
1: This stage is a lot easier to complete as Fiery Mario—you'll be able simply to shoot Boss Bass out of the water.
2: Use the nearby Koopa to reveal the Switch Block. Stomp the Switch Block to convert the blocks into a sea of coins. Try to grab the Fire Flower from the Jump Block, but beware of Boss Bass.
3: Use an Ice Block to make another helpful Switch Block appear. Pound the Switch Block to create a bridge across the waters patrolled by Boss Bass. Boogie across the bridge (holding as you run) and Boss Bass won't be able to catch you. You'll have to hurry though, the bridge won't last long.
4: Time your jump onto the Rotary Lift so that you land just as it finishes a spin. That way, you'll have time to jump off. The pipe just beyond leads to the exit.
5: If you're feeling brave, a lonely 1-Up sits far past the pipe leading to the exit. You'll put yourself in danger trying to get it if you don't remove Boss Bass with a fireball first, but it could be worth it.
Doors, Thwomp Traps, Boo Diddlys and a flooded basement stand between you and BOOM-BOOM. This is a complicated fortress! The doors in the fortress lead to a flooded "back" stage. Most of the doors will just waste your time if you take them, so follow the map carefully.
1: It's difficult to do, but you can warp directly to BOOM-BOOM by entering the third door, then repeatedly tapping as fast as you can.
2: You'll face a double threat near the Thwomp Trap. In addition to having to avoid the dangerous Thwomp Trap, you'll need to outsmart both Boo Diddlys. Be sure to give both ghosts a look as you wait for Thwomp to reset, or one of them will get you. Watch your back and don't let Boo sneak up on you!
3: An easy 1-Up is what awaits you if you take this door. Hit the ? Block so the 1-Up falls to the right.
4: Take this door to BOOM-BOOM. If you're in a hurry to get through the Fortress, head for this door and climb up the steps to the left to go straight to BOOM-BOOM's room.
5: Enter the very last door to gain access to a coin vault (shown right). Jump above the door where you come out to reveal an invisible block that will allow you to hop up and a little to the right to get to another block right next to the wall. this will let you get into the area containing the coins. Simply leap out once you've grabbed the loot.
6: Falling from a door into the flooded basement isn't so bad—going back and forth between the Front and Back of this stage will reset the ? Blocks in the Back Stage, you so can collect them again. The power-ups in the bowels of the fortress will make bringing down BOOM-BOOM much easier.
B: You'll face an extra aggressive BOOM-BOOM at the end of this fortress. This BOOM-BOOM can fly! You'd better stomp this guy three times as fast as you can, otherwise he'll sprout wings and fly about the room. Then he's really tough to defeat.
, and jump at the card at a 45 degree angle.
, and jump at the card at a 45 degree angle.
as fast as you can.
