Each round in Biddle, players are presented with a challenge of what must be rolled on six dice, say, two three-of-a-kinds, a sum of less than 12, or four 3s and two 5s.

The first player states how many rolls of the dice they think will be sufficient to satisfy the challenge. Each subsequent player either calls the bid, undercuts the bid (by proposing a lower number of rolls), or drops out of the bidding phase, believing that the challenge can't be met in the stated number of rolls.

Once at least one person has dropped out and all players are divided into two teams, the players who have made the bid try to satisfy the challenge. If they do, they score points; if not, the doubters score.

The game lasts ten rounds with the points escalating over time. You can score both for doubting and for completing challenges, and in the end whoever has scored the most points wins.