The rules of Twenty Eight
Four players in two pairs, partners sitting alternately; with six, two threes. The 32 cards from seven to ace (36 with six players), jack highest, then nine, ace, ten, king, queen, eight, seven. Jacks are worth three, nines two, aces and tens one: twenty-eight in all.
Half the cards go out, then the bidding: from the table's minimum, usually fourteen, and your partner needs twenty to raise a bid that is already your side's. The highest bidder puts a card face down as the trump, and the rest of the cards go out. A second round lets the bidding side raise, up to bidding all the tricks.
The player after the dealer leads. Follow suit if you can. If you cannot, you may ask for the trump: it is turned over for everybody, and from then on trumps take tricks.
The bidding side needs its bid in points from the tricks it takes. Making it wins game points, failing loses them, and game points run on from hand to hand.