User summary:
ドイス (Dois) is a trick-taking card game from Japan. Dois means two in Portuguese, and in the game there are two decks, one for numbers and one for 4 suits. The decks are shuffled together and players are dealt a hand of 13 cards from the mix. You need at least 3 suit cards and 3 number cards in your hand to begin. Then players play a trick-taking game with trumps, after first predicting how many tricks they will win.

The first play is two cards, a number and suit card. After that, you play one card, a number or a suit card, so that your other card still shows. In this way, you play out 12 tricks and score plus or minus points depending on your prediction. It is recommended to play out 8 games of Dois to get a balanced match.

Publisher's summary:
"ランクとスートを分けた全く新しいトリックテイキングゲームです。
それぞれのカードを1枚ずつ2枚使い1枚のカードを作り、最初のトリックを行います。2回目以降のトリックはどちらか片方を書き換えて行います。

事前に自分の取れるトリック数を予想してその通りにトリックをとれれば点数が入り、8ディールが終了した時点で最も点数の高いプレイヤーが勝利します。"