The facilitator sells each member of the group an agreed number (say 10) of numbered blank cards, for example from series A. A symbolic price, perhaps 1 euro each, can be defined by pooling the common money to form the prize. Each member of the group will sign the receipt that must record the serial numbers that make up the set of cards. Members will try to think of completely implausible solutions, writing one per card.
The cards are placed on a display board (a magnetic board that holds the notations on a plane visible to all would do). Members now have about fifteen whatsapp mobile number list minutes to read, silently, all the solutions and add to them (on other unnumbered cards or post-its) ways they could become, incorporating a more practical solution to solving the problem thus reducing the possibilities of winning that the previous ideas would have.
Each member has two votes (for example, by marking the cards with two sticky stars), which they will use to mark the 2 ideas that they consider most likely than those listed on the numbered cards. The idea that gets the most votes wins the pooled money (the cumulative total). Two subgroups must be formed, delivering 50% of the cards per person who participates.