Preparation
Cut small paper pieces to mark symbols without writing on boards. Test a marker on a square: the drawing should remain recognizable. Collect used markers in a container afterwards so boards can be reused.
Check the sample
Download the two free boards and caller tiles. Check edges, readability and that each player has markers before printing for the whole group. The two-board sample is separate from a pack of 12 or 30 distinct boards.
During the gathering
Agree on the pattern before starting and reveal one caller tile at a time. Keep used tiles visible to check the result. Guests may pass on conversation prompts. No alcohol or betting is needed.