Waluigi for the GameCube

Not to be confused with Mario for the PS4, Shadow the Hedgehog, or Wow! Waluigi.

Waluigi for the GameCube is a cancelled launch title for the Nintendo GameCube centered around Waluigi. In the cover art, Waluigi has a gun of some kind and is in front of an explosion, suggesting they have become a terrorist of some kind. There is very little information on the game besides this cover art, but several anecdotes from those who have played this game at events or in other circumstances appear to paint a fairly decent image of this game and it's contents.

Description
According to many, the game has a prologue with Wario who dies in a violent terrorist attack reminiscent of the infamous Wario Assassination event but at a much larger scale, which makes Waluigi go on a violent quest for revenge. He goes throughout the Mushroom Kingdom, taking down several circles of drug lords, communists, terrorists, and mafias, trying to find the specific assassin who killed Wario and who hired him. Eventually, he finds out it was an inside job from the Castle Freemasons, and that Luigi Harvey Oswald was the one who killed Wario. Upon having a boss fight with Luigi, Waluigi then goes on a raid of the castle to destroy all of the Castle Freemasons, eventually ending with a final boss fight with Todd, leader of the Castle Freemasons, Castle Inside-Job Agency (CIA) and founder of the Illumushroomati that results in Todd escaping into a hidden bunker. Seeing this, Waluigi decides to bomb the entire castle, resulting in the destruction of the Mushroom Kingdom government and the New World Order. Waluigi then creates a new government, with hints that a conspiracy is beginning right beneath him just like what happened before.

Theorizing
This game appears to have been a trailblazer in the Mario franchise, being the first Teen-rated game in the Mario franchise, as every other game is either rated E or E10. It is also a wild departure from other Mario games, depicting intense topics of death, terrorism, politics and conspiracy that are previously unheard of in the series. This, alongside Waluigi's minor role in the series as a whole, likely resulted in the game's cancellation, as it could cause bad publicity. Notably, some say that the levels in this game mirror Wow! Waluigi's levels, implying that game was a family-friendly remake of Waluigi for the GameCube. Why this would have occurred is unknown.