This video shows the locations of each 8bit sprite of Luigi hidden in all worlds of Super Mario 3D World for the Nintendo Wii U. This doesn't include the sprites of Luigi that appear outside the worlds of the game (title screen, electronic manual and so on).

0:00 World 1
1:26 World 2
2:35 World 3
3:56 World 4
5:00 World 5
6:06 World 6
7:40 World Castle
8:59 World Bowser
11:25 World Star
12:15 World Flower

スーパーマリオ 3Dワールド 全 8ビットルイージ