HAGGLE is a thinking game for a large group of people. It can be played at a party or over the course of a full day.
One person serves as moderator, and devises a secret set of scoring rules and prepares a number of colored cards for use as scoring markers. The moderator starts the game by handing each player a sealed envelope containing a small number of colored cards and a couple of scoring rules such as "Orange cards are worth twice the value of blue cards" and "Each white card is worth 5 points unless the player turns in any black cards, in which case white cards are worthless." Players may trade cards and/or information in an attempt to acquire the most valuable hand of cards, all or some of which must be turned in to the moderator at a specified time. When the deadline passes, the moderator scores each player's cards based on all the scoring rules, and the highest score wins.
In this version of Haggle, players have discovered the remains of a spell book torn from its bindings along with some spell ingredients. Their goal is to create the most potent spell through negotiation and trade.