In Cabo, the goal is to minimize the total value of your cards; however, you don't know what all your cards are at the beginning of the game. By using certain cards to peek at your own card, spy on your opponent's card, or swap a card with your opponent, you can try to minimize the value of your cards. When you think you have the lowest value, you can call "Cabo" to end the round, but everyone else gets another turn.
By adding more decks, you can theoretically play with as many players as you want.
This is a commercial version of four-card Golf with special-power cards and a few variant rules.