Goal. Each deal you bid how many tricks you will take — then you must take exactly that many. Winning more is as bad as winning fewer.
The deck. 36 cards: 7 to A in four suits, the red sixes, and two jokers.
A game is a run of deals (Quick = 6, Full = 24): hand sizes 1 → 8, the nines, and back down. After dealing, a card is flipped for trump; on 9-card deals the eldest player names trump or no-trump — after seeing only the first three cards; the other six are dealt once trump is named.
Bidding. In turn you state your trick target (Pass = 0). The dealer bids last and may not make the four bids add up to the tricks — so sometimes the dealer is forced off a number.
Playing. Follow the led suit if you can. If you can't, you must play a trump if you hold one; only with neither may you throw anything. Highest trump wins, else the highest card of the led suit.
The joker. Playable any time. Declare it High (takes the trick) or Low (ducks). When you lead a joker you also name the suit the others must follow — lead it High on the trump suit and nothing beats it.
Scoring. Make your bid exactly: 50 + 50 × bid (a made pass = 50, all tricks = 100 × N). Miss it: 10 per trick taken. Bid one or more and take none and it is a shtanga — the table's own rule: −200, and −500 on the nines, as the Georgian game plays it; a table may instead set −100 a card, a flat −200 or −100, or nothing at all (Pagat's rule). A pulka with every bid made earns your best deal again. Highest total at the end wins.