If every player holds the same board, the first completed pattern will tie across the room. Unique cards spread winners out and keep fundraising games feeling legitimate.
Small groups (under ~25)
Print at least one unique card per person, plus two spares. For kids, extras help when someone tears a sheet.
Classrooms
Match your roster + a few substitutes. If you reuse the same deck weekly, shuffle who gets which serial number so students cannot memorize layouts.
Large halls and fundraisers
Event teams often order hundreds of permutations. Talk to your generator or print vendor about how many distinct layouts exist for your phrase set—picture bingo needs both varied positions and varied images for the giant packs.
When duplicates are acceptable
Practice rounds, craft tables where blackout is unlikely, or simultaneous mini-games in breakout rooms can reuse stock. For prize tables, stay unique.
