Can you tell when someone is bluffing? Roll your stones and up the ante until someone cracks and calls check. Did you bluff well enough or will you lose your stones? Keep your stones to win! To play, you and your opponents start with six stones, three green, three blue. Each stone has two sides, flat and round. Players take turns guessing how many of one type of stone is existing collectively. If someone feels the guess is wrong they may call the player out. If they are right the active player loses a stone and the player who called it starts the next round. Last one standing wins.