On a turn, the active player moves their character to a different location on their player board, takes one or more of the actions visible on that space (often by playing cards from their hand), then refills their hand to four cards. Cards are allies, items, effects, and conditions. You need to use your cards to fulfill your unique win condition.
One of the actions allows you to choose another player, draw two cards from that player's fate deck, then play one of them on that player's board, covering two of the four action spaces on one of that player's locations. The fate deck contains heroes, items, and effects from that villain's movie, and these cards allow other players to mess with that particular villain.
Villainous: Sugar and Spite is playable on its own, and its characters can also face off against those in the other Disney Villainous games.