Players. 4 players in 2 partnerships (N+S vs E+W). 13 cards each.
Bidding. Each player in turn bids a contract (level × strain) or passes. Strain order C < D < H < S < NT. Levels 1..7 represent "take 6 + level tricks".
Three passes end the auction. The last bidder's side becomes the declaring side.
Play. Lead is to the left of declarer. Follow suit if able. Trump beats non-trump (NT = no trump). Highest of led suit wins otherwise.
Goal. Declarer must take at least (level + 6) tricks to make the contract.
v1 note. Free-form auction. No conventions (no Stayman/Blackwood), no dummy reveal, no scoring (vulnerable / doubled / honors). Just made/down.