List of Luigi sightings in New Super Luigi U

In every course of New Super Luigi U is a picture of Luigi hidden, whether it be a sprite, a image in a wall, or otherwise.

Waddlewing Warning!

 * On top of the New Super Luigi U sign in the beginning of the course is an 8-bit sprite of Luigi standing.

Crooked Cavern

 * Right before the normal exit is an 8-bit Luigi sprite under the stairs of Brick Blocks.

Flame-Gear Tower

 * There is an 8-bit Luigi sprite hidden in the gap to the bottom-left of the final gear.

Rolling Yoshi Hills

 * There is a grey spot shaped like Luigi jumping to the left of the second POW Block.

Piranha Heights

 * The room that contains the third Star Coin has a large climbable statue of an 8-bit Luigi made out of colored blocks.

Piranha Gardens

 * There is a large Luigi-shaped hedge near the first Hammer Bro. in the level.

Lemmy's Lights-Out Castle

 * Hidden in the wall above and to the right of the boss door is an 8-bit sprite of Super Luigi.

Spike's Tumbling Desert

 * A bone shaped like Luigi can be seen to the left of the P-Switch.

The Great Geysers

 * Behind the course's starting point is a series of large blocks with lines made to resemble Luigi's head.

Dancing Blocks, Poison Swamp

 * A Luigi sprite can be seen clinging to the top of the secret flagpole.

Boo's Favorite Haunt

 * There is a portrait of Luigi to the right of the door leading to the secret exit.

Rising Piranhas

 * There is a large Luigi-shaped hole in the rock wall just before the Super Piranha Plant next to the secret exit in the ceiling.

Magma Moat

 * There is a statue of Luigi taking off his hat at the secret flagpole.