The year of Waluigi is a celebration of 18 years since his first appearance in 2000. It's like the Year of Luigi, but "With more Wa."
This is the description on Nintendo's E-Shop:
"Wa-ha! This year will be jam-packed with everything Waluigi! Keep a look-out, cause most of the games made by Nintendo will feature the Man in Purple himself! Have a rotten day!"
- Super Smash Bros. Attack (Had Waluigi as a playable character)
- Mario Kart: Hyper Dash (Waluigi gets himself, his own item and stage in the game)
- Waluigi: The purple stars (It stars Waluigi)
- Punch-out: Nintendo Champs (Waluigi is the first boss)
- Wario & Waluigi: Bad for good (Stars Waluigi, along with Wario)
- Nintendo released stop-motion animations staring Waluigi.
- Waluigi was going to star in a spin-off of Dr. Mario called Dr. Waluigi, but it was scrapped.
- Nintendo joked that Waluigi himself made the image above.