Super Mario 3D World Hidden Luigis: World Castle
World Castle-1: Fort Fire Bros.
After you defeat the Fire Bro at the end of the level, rotate the camera and look down and to the right, and 8-bit Luigi can be seen inside one of the windows.
World Castle-2: Switchback Ruins
At the Stamp location, shoot a fireball at the wall to the right to find an 8-bit Luigi hiding in the shadows.
World Castle-3: Red-Hot Run
At the end of the level, look at the top of the volcano to spot Luigi in the background.
World Castle-4: Boiling Blue Bully Bell
Take a look at the spiked rollers to spot an 8-bit Luigi.
World Castle-5: Trick Trap Tower
You can find a large 8-bit Luigi on the wall near the first Green Star.
World Castle-6: Rammerhead Reef
After the Checkpoint but before the Warp Pipe, you'll be able to see an 8-bit Luigi hoping on a rock in the distance.
World Castle-7: Simmering Lava Lake
At the start, change the camera angle and angle it to one side of the barrier to spot an 8-bit Luigi on the other side.
World Castle-Boss: Bowser's Lava Lake Keep
During the opening cutscene, look above the entrance to see the 8-bit Luigi.
If you wait near the beginning of the map, an 8-bit Luigi will appear above the brick behind the gated off lava flow near the Clear Pipe that brought you in.
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Zackery Cuevas is a writer for Windows Central, Android Central, and iMore. He likes playing video games, talking about video games, writing about video games, and most importantly, complaining about video games. If you're cool, you can follow me on Twitter @Zackzackzackery.