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https://www.deviantart.com/jongandee/art/Syd-of-Valis-Styled-Waluigi-946118924 https://www.deviantart.com/flaminghotvids/art/Mlss-wario-wip-939370250

https://www.deviantart.com/domesticmaid/art/Commission-Eggman-and-Wario-1006549984 https://www.deviantart.com/icam2k/art/The-crossover-no-one-asked-for-1009271555

Turns out there was a collection of "Wario Land, crétin" commercials, also another Wario Land 2 commercial besides the one from Netherlands:

https://www.deviantart.com/watashiiz/art/Waluigi-Pinball-1009079522

https://www.deviantart.com/sonicthehedgehog1953/art/Gameboy-Color-and-Gameboy-Advance-Wario-985609421 https://www.deviantart.com/sonicthehedgehog1953/art/GBC-and-NES-Golf-961620554

Now introducing version 1.4.5 of the game, radically changing the editor compared to its predecessor plus with features borrowed from Mario Maker.

https://www.deviantart.com/hypertarget/art/detective-peach-997644383

https://www.deviantart.com/the-elven-gamer/art/Wario-nik-LMAO-1004663053

https://www.deviantart.com/nibroc-rock/art/Wario-Wario-Land-Outfit-Render-873769209 https://www.deviantart.com/giu8520/art/How-Wario-Stole-Christmas-1992-1003615943

https://www.deviantart.com/nibroc-rock/art/Wario-WareLand-Torn-Apart-910099925

https://www.deviantart.com/nibroc-rock/art/Spike-Kart-Render-911492627

https://www.deviantart.com/vexversion/art/Commission-Waluigi-Pro-Golf-Strats-998166271

So the Water Park track in Mario Kart 8 might be referring that Wario owns an amusement park: Although it's not categorized as a Wario track because its staff ghost racers just happen to be Baby Mario and Baby Luigi.

Waluigi Stadum feels like an updated version of Wario Stadium from the N64 era, because of these particular shortcuts: