Truc, Truco, Truque, or Truk is a traditional Spanish card game popular in the Valencian Community, Murcia, and the Balearic Islands in Spain. The game uses a deck of 40 Spanish playing cards (without the 8s, 9s, or wild cards). Cards follow a set hierarchy, where higher-ranked cards win over lower-ranked ones. In case of a tie, the player who led the round, known as the "hand," wins.

Each card has a specific point value, used in the scoring phase. The value of most cards matches their face value, except for tens, elevens, and twelves, which are worth zero. A bonus of 20 points is added to certain card values. The maximum achievable score in a hand is 33 points. In the Balearic version of the game, the hierarchy changes slightly, with the addition of two special cards, the “Master” (11 of clubs) and the “Owner” (10 of golds), which hold the highest ranking and also add extra points when paired with other cards (the Master gives 28 points, and the Owner 27, plus the points from the additional card).

Players are dealt three cards each. At the start of a round, players can optionally make a "call". A player can "call" on their first turn, before answering a challenge or playing their first card. Once a call is made, the trick stage is postponed until the call phase is completed. Players can also “call envido” or “call falta envido” (additional scoring phases). Once the trick phase concludes, it’s determined who won the envido if it was called.

The trick phase is where the card hierarchy comes into play. The ranking order of the cards is:

Horse of clubs (the Master)
Jack of golds (the Owner)
Ace of swords (High Ace of Swords)
Ace of clubs (High Ace of Clubs)
Seven of swords
Seven of golds
All Threes
All Twos
Aces of cups and golds
Kings
Horses of cups, swords, and golds
Jacks of clubs, cups, and swords
Other sevens (cups and clubs)
Sixes
Fives
Fours
Each stage of the trick phase has a point value. For instance, a "trick" is worth 2 points, a "re-trick" is worth 3 points, "vale nine" is worth 9 points, and the “game out” wins the entire match. Players can respond to a challenge with "I accept," "I decline," or can "raise" to increase the points at stake. Only the player receiving the challenge can raise. If a player declines, the round is over.

This game offers a quick-play mode against the computer (no user profile or data connection required), as well as multiplayer options with friends or other app users online. You can play single matches, participate in round-robin tournaments with other registered players, or compete in single-elimination championships where consecutive wins are required to claim the title.