Here is an overview of the game, via Nintendo:
In Paper Mario, his vile viciousness—Bowser himself—has absconded with the magical Star Rod and lifted Peach’s Castle into the sky with the help of Kammy Koopa. Who will stop him now? It’s up to Mario (and you!) to save all seven of the Star Spirits, guarded by Bowser’s handpicked minions. Can you rise to the occasion and pull off a storybook ending?
Nintendo 64 – Nintendo Switch Online is available as part of the Nintendo Switch Online + Expansion Pack membership, which includes access to various other Nintendo 64 and Sega Genesis titles, as well as the Animal Crossing: New Horizons – Happy Home Paradise downloadable content.
Watch a trailer below.