As cards are drawn and played from the deck, the rules of the game change from how many cards are drawn, played or even how many cards you can hold at the end of your turn. No one can win until a Goal card sets the conditions for winning, which is typically collecting certain Keeper cards in front of you. Goals can keep changing, though, so you never know for sure how to win.
With Adventure Time Fluxx, you get to join Jake the dog and Finn the human for some ever-changing fun. Draw a card, Play a card, and change the Rules. Get Mathematical against Candy Zombies, visit the City of Thieves to steal from your friends, and maybe, if things work out just right, you might even get to Floop the Pig!