What Every Bingo Card Column Means
A standard bingo card is a 5x5 grid with five columns labelled B, I, N, G, and O. Each column holds numbers pulled from a fixed range: B carries 1–15, I covers 16–30, N runs 31–45, G holds 46–60, and O spans 61–75. The centre square on the N column is a free space — it counts as already daubed when the
round starts. In our Blackout Bingo room, every square on the card must be covered to claim the win. Other rooms accept shorter patterns like a single line across, down, or diagonally. Knowing which pattern a room is using before the first ball drops is the single most important rule to check.