Quando

The card deck consists of 55 double-sided cards. The digits 0-10 appear in every combination on these cards, with the digits always differing. Players start with 7-8 cards in hand depending on the player count. On a turn, you do one of two things, looking only at the side of the cards facing you:

End your turn by drawing one card from the deck and adding it to your hand. If you have played exactly three cards with the same number, each other player must flip a zero in their hand to the other side or draw a card from the deck.

Each time you draw a card, you can place it in your hand with the already revealed side facing you or flip it to the other side, after which you can't flip it back.

If a player has only zeroes in their hand at the end of their turn, they reveal them to end the round immediately. Otherwise, a player can choose to knock to end the round, after which each other player can take one final turn. No matter how the round ends, players then sum the value of cards in their hand. The player with the lowest sum scores 0 points, while everyone else scores their sum; if a player knocked, then didn't have the lowest sum, they score a 5-point penalty in addition to their sum.

Play multiple rounds until a player has 50+ points, at which time the player with the lowest score wins.