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https://www.deviantart.com/flaminghotvids/art/Wario-and-waluigi-apparition-908950089

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.