Bingo patterns and blackout bingo, explained
Bingo patterns with a diagram for each: line, four corners, postage stamp, X, picture frame, crazy T, blackout. Why one card needs about 73 calls.
One full line wins fast. Bingo patterns give you longer rounds, or just different ones: you pick a shape and announce it before the first call.
Quick answer: A bingo pattern is the shape you must cover to win. The most common is one full line: a row, column or diagonal. Others include four corners, a 2×2 postage stamp, an X and a picture frame. Blackout, or coverall, means covering the whole card. One 75-ball card with a free space needs about 73 calls on average to black out.
What is a bingo pattern?
A bingo pattern is the shape you need to cover before you can call bingo. The caller names it before the round starts. Arrow International, a maker of bingo paper, defines a pattern as "the shape you need to cover on your card with called-out numbers."
The law sees it the same way. New Hampshire's statute defines bingo as a prize for "first covering squares in a predetermined design" on a card. In licensed halls, the state allows only "game patterns that have been approved by the commission."
On cards you print at home, a pattern is a house rule. Pick it, say it out loud before the first call, and keep it for the whole round. The center free space counts as covered whenever the pattern runs through it. The exception is a "hard way" game, which Arrow describes as "a bingo pattern in a straight line without the use of the free space."
Players often sort patterns into two kinds. A fixed pattern sits in one place on the card, like the four corners. A "crazy" pattern keeps its shape but can face any direction, so players have more ways to win.
Common bingo patterns, with diagrams
Each diagram shows a 5×5 card. Pink squares are the ones to cover, and the yellow square is the center free space.
One line: row, column or diagonal
One line means five squares in a row, going across, down or corner to corner.
It's the default win and the quickest round. Arrow puts it plainly: "The most basic patterns are straight lines in a horizontal, vertical or diagonal direction." A 5×5 card has 12 lines: 5 rows, 5 columns and 2 diagonals. Arrow's simulation tables list it as "Any Straight Line," with 12 ways to win.
Lines come quickly on custom cards too. In our simulation (10,000 decks per setup, 100 games each), 20 players shared a 40-item list. The median first line came at call 5 on 3×3, 11 on 4×4 and 13 on 5×5.
This is the only win BingoCard Lab cards are built around. No two cards in a set share the same items in a full row, column or diagonal.
Four corners
Four corners means covering the four corner squares and nothing else.
It's easy to check from across the room, because the winning squares sit at the edges. It's a good pick for young kids, since the corners are easy to find. A full line doesn't win in this round unless you say it does.
Postage stamp
A postage stamp is a 2×2 block of squares in one corner of the card.
Arrow defines it as "matching four numbers to form a postage stamp (a 2 x 2 grid) in any of the four corners." Decide before the round whether any corner wins or only one. Arrow's simulation calls the flexible version "Any Corner Stamp."
Some callers ask for two stamps at once, so 8 squares. It turns the same idea into a longer round.
Letter X
The letter X means covering both diagonals of the card.
Arrow says the X pattern "tells players that they must cover both diagonal rows to win." The diagonals cross on the free space, so players mark 8 squares. Other letters and numbers work the same way, such as an L, a T, a Z or a 7. Draw the shape first so nobody argues later.
Picture frame
A picture frame means covering every square on the outside edge of the card.
It needs 16 squares and never touches the free space, so it runs long. Arrow's simulation tables call it "Large Frame." Play it when you want a round that lasts but stops short of a blackout.
Crazy T
A T is the top row plus the middle column, running down to the bottom edge.
In a crazy T, the shape can face any direction: upright, upside down or on its side. Any of those four versions wins. Players mark 8 squares, because the T's stem runs through the free space. Arrow's tables include a "Crazy T" game.
Blackout, also called coverall
Blackout, or coverall, means covering every square on the card.
It's the longest round, so it gets its own sections below.
Which bingo patterns are fastest?
A single line is the fastest common pattern, and a blackout is the slowest. In general, the more squares a pattern needs, the more calls it takes.
The numbers below come from Arrow International's game pattern tables. They're based on 70,000 simulated games on 5×5 cards, shown here with 500 cards in play.
| Pattern | Squares to cover | Average calls |
|---|---|---|
| Any line | 4 or 5 | 12.10 |
| Postage stamp, any corner | 4 | 13.25 |
| Four corners | 4 | 18.77 |
| Crazy T | 8 | 30.65 |
| Letter X | 8 | 35.62 |
| Picture frame (Large Frame) | 16 | 53.12 |
| Blackout (coverall) | 24 | 60.17 |
Four corners and a postage stamp both need 4 squares, yet the corners take longer. Only one set of corners exists, while a stamp can land in any of four corners. More ways to win means an earlier winner.
These are hall numbers, with hundreds of cards in play. A living-room game with 20 cards and a word list won't match them. The broad order still holds: small shapes come early, the frame and the blackout come late.
What is blackout bingo?
Blackout bingo, also called coverall, is a game where you must cover every square on your card. Arrow notes it is "typically played late in a bingo session."
How regulators define a coverall
Minnesota's bingo rules manual has an entry for the "Cover-all game (blackout)." There, a player "must cover all spaces except the center free space to win."
New Hampshire's statute defines a coverall as a 75-ball game. The prize goes to "the first player who covers all 24 numbers on a card."
A hall operator, Roseville Bingo, puts it simply: "all spaces on a single card must be called and daubed to win."
Does the free space count in a blackout?
Yes, in the sense that it never needs a call. Minnesota says "except the center free space." New Hampshire says "all 24 numbers." Both describe the same 24 squares to daub.
On BingoCard Lab cards, the free space is optional and sits in the center only. Turn it off, and a 5×5 blackout needs all 25 items called.
How many calls does a blackout take?
A blackout takes at least 24 calls on a 5×5 card with a free space. One specific 75-ball card needs about 73 calls on average. With 500 to 6,000 cards in play, Arrow's simulation puts the average first winner at about 56 to 60 calls.
| What you measure | Calls | Source |
|---|---|---|
| Minimum, any card | 24 | One call per square |
| One card, average | About 73 (72.96) | Our calculation, formula below |
| First winner, 500 cards in play | 60.17 | Arrow simulation |
| First winner, 6,000 cards in play | 55.58 | Arrow simulation |
The minimum is one call per square
Every square needs its own call, so the minimum equals the number of squares to cover. That's 24 on a 5×5 with a free space and 25 without. A 4×4 needs 16. A 3×3 needs 8 with a free space or 9 without.
Hitting the minimum means every call lands on your card, one after another. On a 75-ball card, that almost never happens.
Why your own card needs about 73 calls
Your card blacks out on the call that covers its last number. So the real question is when the last of your 24 numbers comes up.
Think of all 75 calls as a line-up, with your 24 numbers at random spots in it. For k random spots among N, the last one sits at k(N + 1) ÷ (k + 1) on average.
We worked it out for one card, with k = 24 and N = 75: 24 × 76 ÷ 25 = 72.96. A single card blacks out around call 73 of 75, on average.
Early blackouts on one card are rare. The chance that one card covers within 54 calls is C(54,24) ÷ C(75,24) ≈ 0.000054, about 1 in 18,000 (our calculation).
Why the hall's first blackout comes sooner
In a hall, the game doesn't wait for your card. It ends when the first of hundreds of cards fills up, and one of them usually gets lucky early.
Arrow's simulation puts the average first coverall at 60.17 calls with 500 cards in play, and 55.58 with 6,000. Arrow's glossary says "50 to 60 of the 75 bingo numbers" usually have to be called. It adds that coveralls "in as few as 43 numbers have been recorded."
So when someone shouts coverall and your card is far from full, nothing went wrong. Those figures describe the hall's first winner, not your card.
How to run pattern games with printed cards
Pick the pattern, announce it before the first call, and check any winner's card against the items you've called.
Announce it. Say the pattern and show it. Hold up a card with the shape marked in pen, or sketch it on a board. For a crazy pattern, show one version and say it can turn.
Check it. Tick each item on the call sheet as you call it. When someone shouts bingo, read their pattern squares back and match each one to a tick. The printed call sheet states the line rule, so tell players when tonight's round is different.
Stack rounds. You can play several patterns on the same cards. Start with a line, keep marking, then go for an X, then a blackout. Minnesota's manual allows the same in halls: "Up to three patterns may be played on one face."
Watch your list length. If your list has exactly as many items as a card has squares, every card holds every item. Everyone then blacks out on the same, last call. For a blackout, use a list well above the card size. In our bingo card maker, a list holds up to 60 items.
Pick the grid. Smaller grids make short blackouts and quick pattern rounds. They suit young kids, or a short game at the end of class.
| Grid | One line | Four corners | Blackout |
|---|---|---|---|
| 3×3 | 3, or 2 plus the free space | 4 | 9, or 8 plus the free space |
| 4×4 | 4 | 4 | 16 |
| 5×5 | 5, or 4 plus the free space | 4 | 25, or 24 plus the free space |
BingoCard Lab cards are ordinary grids, so you play any pattern as a house rule on the printed cards. The "no shared winning line" guarantee covers rows, columns and diagonals only. Words-only cards are free.
For a class, classroom vocabulary bingo on a 3×3 or 4×4 makes quick pattern rounds. Four corners works well with Halloween picture bingo for kids. A blackout makes a calm last round after dinner with family Thanksgiving picture bingo or family Christmas picture bingo. For more ideas, see Christmas bingo ideas and Thanksgiving bingo ideas.
Bingo pattern FAQ
What is it called when you cover all squares in bingo?
It's called a blackout or a coverall. Both names mean the same game: you cover every square on the card. Minnesota's bingo rules manual lists it as "Cover-all game (blackout)." On a standard 5×5 card, that's the 24 numbered squares plus the free space.
Is bingo 4×4 or 5×5?
Hall bingo uses a 5×5 card. New Hampshire's rules define a card as "a grid of 5 rows of 5 squares," with a free space in the center. Minnesota's bingo face has the same 25 squares. At home, any size works. You can create custom cards in 3×3, 4×4 or 5×5.
Can you win bingo with four corners?
Yes, when the caller announces four corners for that round. The four corner squares then win, and a full line doesn't. If nobody announced a pattern, the usual win is one full row, column or diagonal, as in the standard bingo rules. Four corners is a house rule, so settle it before the first call.
How many numbers are called in blackout bingo?
At least 24 on a 5×5 card with a free space, since each square needs its own call. Arrow's glossary says "50 to 60 of the 75" numbers usually have to be called. Its simulation puts a hall's average first coverall at about 56 to 60 calls. One specific card takes longer: about 73 calls on average, from the formula 24 × 76 ÷ 25.
Is Blackout Bingo the same as regular bingo?
Blackout is a round of regular bingo where the goal is the whole card, not one line. Blackout Bingo is also the name of a mobile app, which is a separate game. To play the classic version, call items as usual. The first player to cover every square wins.
Ready for a pattern round? Make your own cards, print them, and announce the shape before the first call.