If you cover more cards than opponent, you win the set.
Higher card covers lower card of the same suit.
Choose some your card and cover some opponents card. Then, your Opponent covers some your card.
When the Opponent have no card to cover, he "Passes". If you have covered more cards, than opponent in current set, you win the set and go to the next level.
Of course, the next level will be more erotic!
Drag your card and place it over some opponents card.