BLUFFIT is a simple and tense bluffing game in which players compete to score the most points. All players start with a hand of cards numbered 1–10. To set up, reveal random cards equal to the number of players from a separate set of 1–10 cards.

All players simultaneously play a card from their hand face down. Then, in turn, players either claim one of the available scoring cards or challenge another player who has already claimed one. In a challenge, both players secretly compare strength cards, with the higher card winning the scoring card (in a tie, the challenging player wins).

Once all players have acted, remove any unclaimed scoring cards from the table. Claimed scoring cards are placed in each player’s score pile. The played strength cards are then shuffled and revealed to form the new set of scoring cards for the next round. After ten rounds, players complete one final round using the cards last played by selecting a card from their score pile. Those played cards are removed from the game, claimed cards are added to score piles, and the player with the highest total wins.

BLUFFIT includes four optional special cards per player, such as "The Optimistic 1" (which beats a 10 in a challenge) and "The Flipped 5" (which beats 6-10, but loses to 1-4). To use them, replace the regular number in each player's hand with the special card.