ルイス (luz) is a trick taking game where players cannot see the cards they have.
In this game, you must hold your cards so that their face values can be seen to other players only. The colors (suits) of cards are painted on both sides, therefore suits are known to all players, and one of the other players sorts your cards by color first, then number in ascending order. But because not all cards are dealt to the players, you cannot have complete information of your cards.
With such limited information, you bid for how many tricks you will win, and try to win that many tricks or to foil the contract another player made.