All cards are dealt. 2–4 players use 52 cards; 5–8 players use two decks (104).
Whoever holds the A♠ (Hukum Ka Ikka) starts. In a two-deck game, one of the two holders is picked at random.
Whoever opens a round throws 1–4 face-down cards and picks the table rank. Everyone after must declare that same rank until the pile is cleared. You may lie.
Facing a claim, each player in turn can call BLUFF!, throw their own 1–4 cards on top (accepting the claim), or pass.
The pile vanishes only after everyone has passed, including the player who threw last (who may also throw more).
Bluff caught: the liar takes the whole pile and the challenger starts. Truth told: the challenger takes the pile and the truthful player starts.
If everyone passes, the pile vanishes for good and the A♠ player starts again.
Empty your hand to win, but the others get one last chance to challenge your final throw.