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In a similar vein to New Super Luigi U, 8-bit sprites of Luigi are hidden in most courses of Super Mario 3D World. Note that the 8-bit Luigis that can be found in the levels of World Mushroom and World Flower are in the same locations as their counterparts in the other worlds of the game; as such, only Luigis unique to those levels are listed.
Overworlds
| World | Picture | Luigi Location |
|---|---|---|
| World 1 | 
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An 8-bit Luigi will occasionally pop out of the pipe on the above ground sections on the World 1-2 icon. |
| World 4 | 
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By taking the Warp Pipe to the upper platform an 8-bit Luigi can be seen ducking behind a rock after the camera angle shifts. |
| World 6 | 
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By changing the camera angle near the bridge dividing the two sections of the world, an 8-bit Luigi can be seen in the water below. |
| World Castle | 
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By waiting near the beginning of the world an 8-bit Luigi will appear above the brick behind the gated-off lava flow to the right of the Clear Pipe leading to the world. |
| World Bowser | 
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Changing the camera angle when near the hidden Toad House reveals an 8-bit Luigi on the wall. |
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An 8-bit Luigi can be seen riding on the Ferris wheel. |
World 1
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 1-1 | Super Bell Hill | 
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After dropping out of the clear pipe near the halfway point, the player can meet with a Sprixie with a pair of binoculars who can show them a view of the goal's location. An 8-bit Luigi can be seen behind the fence near the bushes. However, Luigi disappears if players try to approach his hiding location. |
| World 1-2 | Koopa Troopa Cave | 
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Luigi will appear on the pipe on the overworld icon for this stage. In the actual stage, Luigi can be seen doing a squat dance in the bottom right corner at the beginning of the stage; it can be seen by tilting the camera right. Another Hidden Luigi is found at the same place with the Squatting Luigi. Just wait until the timer is 105 and it will appear on top of pipe and there he is. the same one in 2-2. This is 1/2 pipes in the game that have different coding in them then a regular pipe |
| World 1-3 | Mount Beanpole | 
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Players should meet with a Sprixie with binoculars on the left tree at the beginning of the stage. Through the binoculars, there is an 8-bit Luigi on a wall hidden within the shadow of the mountain's highest tree. |
| World 1-4 | Plessie's Plunging Falls | File:SM3DW 1-4 Luigi.jpeg | Directly after the first set of boost panels, there is an 8-bit Luigi floating on the surface of the water. |
| World 1-5 | Switch Scramble Circus | 
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On the first spade-shaped mirror at the start of the level, a running 8-bit Luigi can be seen in its reflection. |
| World 1-castle2 | Bowser's Highway Showdown | 
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During the cutscene that plays when entering the castle, an 8-bit Luigi can be seen on top of the arch at the entrance, over the brick on the right. |
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A giant 8-bit Luigi can be seen strolling along the water in the background before disappearing below the surface. |
World 2
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 2-1 | Conkdor Canyon | 
|
Underneath the platform past the shifting platforms just after the checkpoint, an 8-bit Luigi can be seen. |
| World 2-2 | Puffprod Peaks | 
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An 8-bit Luigi can seen within the particle effect on the first platform after touching it with the Wii U GamePad. |
| World 2-3 | Shadow-Play Alley | 
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Players should climb the wall at the start to see the shadow of an 8-bit Luigi in the top left corner. |
| World 2-4 | Really Rolling Hills | 
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An 8-bit Luigi will pop out of the Warp Pipe leading to the underground section when the timer has 100 seconds remaining. |
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An 8-bit Luigi occasionally can be found at the bottom of the large rolling hill before the Checkpoint Flag as it rolls. | ||
| World 2-5 | Double Cherry Pass | 
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At the right fence at the end of the level, there is an 8-bit Luigi hiding in one of the posts. |
World 2- Tank
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Bowser's Bullet Bill Brigade | 
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At the start of the level an 8-bit Luigi can be found along the right set of tank treads. |
World 3
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 3-2 | Chain-Link Charge | 
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If the sign near the Checkpoint Flag is broken, an 8-Bit Luigi can be found behind it. |
| World 3-3 | Shifty Boo Mansion | 
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The player must first collect all six + Clocks in the level (those in bold require the Cat Suit):
Upon reaching the Goal Pole, they must then wait until 12 seconds remain on the timer; at that point, several 8-bit Luigis can then be seen rising from the graves and running in the background. |
| World 3-5 | Pipeline Lagoon | 
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An-8 bit Luigi can be seen within the Clear Pipe before the Checkpoint Flag, but only if the player is fast enough. |
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Near the beginning of the level an 8-bit Luigi can be seen floating in the water. | ||
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An 8-bit Luigi can occasionally be found inside the mouth of a Cheep-Cheep, stuck head-first. | ||
| World 3-6 | Mount Must Dash | 
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Reach the end of the stage within 325-320 seconds on the clock. An 8-bit Luigi will pass by the finish line before vanishing. |
| World 3-7 | Switchboard Falls | 
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Using the Sprixie's binoculars, an 8-bit Luigi can be seen above one of the waterfalls. |
World 3- Train
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The Bullet Bill Express | 
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At the end of the Bowser Train, an 8-bit Luigi can be seen outrunning the Bullet Bill Train. |
World 4
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 4-1 | Ant Trooper Hill | 
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An 8-bit Luigi is seen hiding behind a platform with a Sprixie holding binoculars. She isn't needed to see it, but it will vanish in certain camera angles. |
| World 4-2 | Piranha Creeper Creek | 
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After completing the level, a small, ducking 8-bit Luigi can be seen on the bottom right corner of the screen. |
| World 4-3 | Beep Block Skyway | 
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Several 8-bit Luigis can be seen scrolling across the electronic screens in the level. |
| World 4-4 | Big Bounce Byway | 
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By ground pounding the cloud under the Warp Box near the end of the level an 8-bit Luigi can be seen before the cloud pops back. |
| World 4-5 | Spike's Lost City | 
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Near the beginning of the level, before the first Galoombas, an 8-bit Luigi can be found amongst some vines on the wall. |
| World 4-castle2 | Lava Rock Lair | 
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An 8-bit Luigi can be found on the top of the bridge used to access the first Green Star before it is lowered. |
World 5
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 5-1 | Sunshine Seaside | 
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Using the Sprixie with binoculars reveals an 8-bit Luigi on top of a nearby tree. |
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Burning the bush closest to the left side of the Warp Pipe at the end of the Plessie section reveals an 8-bit Luigi. | ||
| World 5-2 | Tricky Trapeze Theater | 
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An 8-bit Luigi can be seen at the beginning of the level by looking at the bottom of one of the columns, somewhat obscured by the clouds in the bottomless pit below. |
| World 5-4 | Sprawling Savanna | 
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Two Luigi sightings can be found: After blasting out of the fifth cannon, players should go to the bottom right of the area, where an 8-bit Luigi can be seen painted into the grass. The other can be seen above the pipe by the Sprixie with binoculars. |
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| World 5-5 | Bob-ombs Below | 
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By waiting for seventy seconds after entering the level, an 8-bit Luigi can be seen running across the bottom of the screen. |
World 6
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
| World 6-1 | Clear Pipe Cruise | 
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When collecting this level's Stamp by travelling on top the Cannon Pipe, a 8 bit Luigi can be seen imprinted on the section going upward. |
| World 6-2 | Spooky Seasick Wreck | 
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Near the beginning of the level, an 8-bit Luigi can be seen inside one of the ships. |
| World 6-3 | Hands-On Hall | 
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If the player continuously hits the gong, an 8-bit Luigi will eventually appear. |
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Tilting the camera at the end of the level at the right side of the roof reveals an 8-bit Luigi in one of the windows below. | ||
| World 6-4 | Deep Jungle Drift | 
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By changing the camera angle near the flagpole a somewhat obscured ducking 8-bit Luigi can be seen in the distance. |
| World 6-5 | Ty-Foo Flurries | 
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Upon reaching a Sprixie with binoculars, players should go next to it and tilt the camera to the right. A small 8-bit Luigi can be seen behind the fence where the Sprixie is. |
| World 6-6 | Bullet Bill Base | 
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Upon reaching a Sprixie with binoculars, players should go next to it and tilt the camera to the right. A small 8-bit Luigi is on the corner of the fence where the Sprixie is. |
| World 6-7 | Fuzzy Time Mine | 
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An 8-bit Luigi can be found by burning a bush near the flagpole. |
World Castle
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
World  Castle-1
|
Fort Fire Bros. | 
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After defeating the Fire Bro. at the end of the level and changing the camera angle to look down and to the right, an 8-bit Luigi can be seen inside one of the windows; this only appears after the Fire Bro. is defeated. |
| World Castle-2
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Switchblack Ruins | 
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By lighting the wall around the location of the Stamp by tapping it with the GamePad, a ducking 8-bit Luigi can be seen. |
| World Castle-3
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Red-Hot Run | 
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At the end of the level, an 8-bit Luigi can faintly be seen on top of the volcano in the background. |
| World Castle-4
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Boiling Blue Bully Belt | 
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8-bit Luigis can be found on the spiked rollers. |
| World Castle-5
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Trick Trap Tower | 
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A large 8-bit Luigi can be seen on the wall near the first Green Star. |
| World Castle-6
|
Rammerhead Reef | 
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By looking off to the right near the Warp Pipe after the Checkpoint Flag, an 8-bit Luigi can be seen jumping on a rock in the distance. |
| World Castle-7
|
Simmering Lava Lake | 
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Changing the camera angle at the beginning of the level reveals an 8-bit Luigi on one side of the barrier behind the starting point. |
| World Castle-castle2
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Bowser's Lava Lake Keep |
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Like the World 1 castle, an 8-bit Luigi can be seen during the cutscene showing the player entering the castle, over the entrance. |
World Bowser
| Level Number | Level Name | Picture | Luigi Location |
|---|---|---|---|
World  Bowser-1
|
Spiky Spike Bridge | 
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By adjusting the camera near the first Warp Box, an 8-bit Luigi can be seen on the side of the ledge. |
| World Bowser-2
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Plessie's Dune Downhill | 
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Similar to Sprawling Savanna, this Luigi is imprinted on the left side of the grass after the ride with Plessie. |
| World Bowser-3
|
Cookie Cogworks | 
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Near the Checkpoint Flag is a Sprixie with binoculars. If the player uses her to check the wall on the left, a figure of an 8-bit Luigi can be seen. |
| World Bowser- Train
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The Bowser Express | 
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An 8-bit Luigi is seen near the Warp Pipe that leads to Pom Pom, imprinted right below a hidden block on the side of the train. |
| World Bowser-4
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Footlight Lane | 
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Occasionally, an 8-bit Luigi can be seen on the back of the first Thwomp in the level. |
| World Bowser-5
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Deepwater Dungeon | 
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Shortly after riding Plessie, players should be in Cat Mario form and climb the right wall. Then, players must jump to the adjacent wall and walk along the top of it until they reach the third stone block, where a crouching 8-bit Luigi can be seen. |
| World Bowser-6
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A Beam in the Dark | 
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By waiting until around thirty seconds remain on the timer and jumping on the flagpole, an 8-bit Luigi can be seen on the moon. |
| World Bowser-castle2
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The Great Tower of Bowser Land | 
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At the beginning of the stage, hitting Bowser Mobile a few times will cause an 8-bit Luigi to fly out. |
World Star
| World Number | World Name | Picture | Luigi Location |
|---|---|---|---|
World  Star-3
|
Rolling Ride Run | 
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A Sprixie with binoculars can be used to check the second part of the level to see an 8-bit Luigi on the wall. |
| World Star-4
|
The Great Goal Pole | 
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By running along the never-ending path of Donut Blocks an 8-bit Luigi can eventually be seen. |
| World Star-5
|
Super Block Land | 
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Breaking a giant Brick Block next to the ground after the Checkpoint Flag reveals an 8-bit Luigi on the wall behind where it was. |
| World Star-6
|
Honeycomb Starway | 
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An 8-bit Luigi is on the upper right honeycomb next to the Warp Box. |
| World Star-7
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Gargantuan Grotto | 
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An 8-bit Luigi can be seen at the bottom of one of the vines in the foreground of the level, near the first Green Star. |
World Flower
| World Number | World Name | Picture | Luigi Location |
|---|---|---|---|
World  Flower-9
|
Towering Sunshine Seaside | 
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By heading to the left of the level and climbing one of the trees, the camera angle shifts to reveal an 8-bit Luigi over the tallest Goomba Tower. |
Other
| Location | Picture | Luigi Location |
|---|---|---|
| Title Screen | 
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An icon of Luigi will appear after Luigi Bros. has been unlocked. |
| Electronic Manual | An 8-bit Luigi can be seen at the bottom of Page 8 in the game's electronic manual. | |
| Opening Scene | 
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Several 8-bit Luigis are hidden among the items coming out of the Clear Pipe. |
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| Ball minigame | 
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In the ball minigame, sometimes, an 8-bit Luigi can appear on the ball. |
| Sprixie House | 
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Moving the birds away from the windows reveals an 8-bit Luigi on the very left peeking in, which ducks down out of sight after a few seconds. |
| Confetti/snow | 
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Levels featuring falling snow or confetti have 8-bit Luigis floating amongst them. |
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| ? Blocks | 
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An 8 bit Luigi will occasionally pop out of a ? Block. |
| Lucky House | 
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A Luigi sprite will appear for a split second during the showering of coins after winning. |