Rest assured we've looked into this extensively! "TOO BAD. WALUIGI TIME" is an unofficial work of parody and is not affiliated with Nintendo.
All of the art contained in this book has been created from scratch by the author himself. The book will stand alone as a creative work, but will not function as a replacement for any game, storylines, game guides or other official products.
Like Brawl in the Family, "TOO BAD. WALUIGI TIME" shares company with numerous other gaming-webcomics-turned-into-books, and various merchandise found on sites like Fangamer that pay homage to the games we all know and love while creating unique artistic works.
And believe it or not, a Nintendo of America employee actually was a backer for BitF: The Complete Collection!