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The aim is to be first to get rid of all of one's cards.
A card can only be played if it corresponds to the suit or value. For example, if it is the 10 of spades, only another spade or another 10 can be played (but see below for Jacks and Aces).
If a player is not able to do this, they draw one card from the stack; If they can play this card, they may do so; otherwise, they keep the drawn card and their turn ends.

If a 2 is played, the next player has to draw two cards. But if the player facing the 2 plays another 2, next player must take 4 cards from the pack, unless they too play a 2, in which case next player must take 6 cards from the pack, unless they too play a 2, in which case next player must take 8 cards from the pack.)

A Jack of any suit can be played on any card. The player who plays it then chooses a card suit. The next player then plays as if the Jack was of the chosen suit.

An Ace of any suit can be played on any card. The next player has to draw four cards. But if the player facing the Ace plays another Ace, next player must take 8 cards from the pack, unless they too play an Ace, in which case next player must take 12 cards from the pack, unless they too play an Ace, in which case next player must take 16 cards from the pack.)

If an Eight is played, next player facing the Eight must play another Eight or they stand for one turn.

If a player does not call "Last card" before or slightly after laying down their penultimate card (double tap on your score) and is caught before the next player in sequence takes their turn (i.e., plays a card from their hand, draws from the deck, or touches the discard pile), they must draw two cards as a penalty. If you see that your rival has not called "Last card", double tap on their score and they will have to draw penalty cards.

In Beginner mode you can see the cards of your opponent, the stack and the deck.