• 1. The board: There are 21 hidden cards: three copies of every number from 1 to 7.
• 2. Valid trios: A trio is either three equal numbers, such as 4-4-4, or three consecutive numbers, such as 3-4-5.
• 3. Your turn: Before flipping, you may call END. Otherwise, privately flip exactly one unclaimed card, remember it, and hide it again.
• 4. Reveal a trio: After your private flip, you may select three unclaimed positions and publicly reveal them. You may reveal at most one trio per turn.
• 5. Score: A valid trio earns 1 point. Those three cards stay face-up and cannot be used again.
• 6. Wrong trio: If the three cards are not a valid trio, everyone sees them once, they are covered again, and your turn ends.
• 7. Call END: If no valid trio remains among the unclaimed cards, the caller earns 3 points. If any trio remains, the opponent earns 3 points.
• 8. Finish: The game ends immediately when all 21 cards have been successfully claimed into seven trios. It also ends when a player calls END. The player with the higher score wins; equal scores are a tie.

The game will immediately reveal every remaining card.