Rules & objective
Selected Perez/Cytro Cuban Longana recorded by Pagat. The original account leaves blocked scoring unspecified. This digital agreement awards a genuine block to the unique lowest remaining pip total, earning ALL remaining pips including their own. Tied minima earn no points; seek a double holder to the right of the previous opener next hand. Opening order is recorded when a branch first opens; repeated passes retain it. Your own branch is exempt from equal-end priority; doubles on another open branch obey it. Redeal only if nobody holds a double. Selection and hints preview until confirmation. Local handoff hides hands; all hands reveal only at hand end. Computer and hints use only their own hand and public information, with bounded heuristics. Rules and records pause the computer. Undo includes its whole response, Redo restores it. Restart retains this hand’s starting deal and prior scores. No timer, wagering or turn cap.
Use all 55 double-nine tiles; deal eight each and leave the rest unused for the whole hand. No drawing. The first hand begins with the highest held double. Later the winner chooses any held double; if they have none, seek the next holder counterclockwise. If nobody holds a double, reshuffle and redeal. After the opening, play continues to its right: seats 1→2→3→4 are south→east→north→west. Play one matching tile when able: on your own branch, a double on any branch, or any tile on the open branch of a player who passed. You cannot pass while able to play. Passing opens your branch; playing anywhere closes your own branch again. When several open branches share an end value, another player must use the earliest opened one; your own branch is exempt. Doubles lie across a branch without splitting it or granting extra turns. Emptying your hand earns all opponents’ remaining pips. First to reach 100 points wins.
Controls
Play directly on the cards or board with mouse or touch. Coordinate selectors are optional keyboard aids.
Worked example
Players have separate arms. Open-arm priority can require a particular placement even when another endpoint also matches.