Quick answer
The inside square, also called the small picture frame, is the ring of 8 squares that surrounds the free space: the middle three squares of rows 2 and 4, plus the middle squares of the I and G columns. It needs all 8 numbers because the free space is inside the frame, not on it. One card has a 3.2% chance by call 50; with 500 cards in play, the first one typically lands near call 37.
Which squares make the inside square?
Look at the 3x3 block in the middle of your card. The inside square is its border, with the free space left in the middle:
- Row 2: I2, N2, G2
- Row 3: I3 and G3 (the free space between them doesn’t count)
- Row 4: I4, N4, G4
That’s 8 numbers: three from the I column (16–30), two from N (31–45) and three from G (46–60). Nothing from B or O matters.
Inside square odds by call
Exact figures for one card:
| Calls made | Chance one card has the inside square |
|---|---|
| 30 | 0.03% |
| 40 | 0.46% |
| 50 | 3.2% |
| 60 | 15% |
Half of single cards finish by call 70. In a room, our simulation puts the first winner around call 47 with 50 cards and call 37 with 500 cards, very close to other 8-number patterns like the diamond and plus sign.
Why players like it
The inside square is compact and easy to track. All eight squares sit together in the middle of the card, so you can see at a glance how close you are. Compare that with the outside edge, which spreads 16 squares around the whole border.
Tips for players
- Concentrate on I and G. Six of your eight squares are in those two columns.
- Think in rows. Rows 2 and 4 each need three, and row 3 needs two. It’s often easier to track “what’s left” by row.
- Play several cards if you can track them. Since the pattern is compact, it’s easier than most to watch on multiple cards.
Tips for callers and hosts
Pair the inside square with the outside edge in the same session: players enjoy the contrast between the “small frame” and the “big frame,” and the length difference is large. The inside square suits a mid-sized prize. It’s also a handy game for large-print cards at senior centers, since the squares are bunched in the middle where they’re easiest to see.
Variations
- Filled inside square: the whole 3x3 center block, adding the free space. That’s 9 squares and still 8 numbers, so it plays identically.
- Sputnik: the inside square plus the four corners.
- Picture frame: the full outside edge, 16 numbers.
Frequently asked questions
What is a small picture frame in bingo?
It's another name for the inside square: the eight squares forming a ring around the free space. It's a smaller version of the picture frame, which runs around the outer edge of the card.
Do you need the free space for the inside square?
No. The free space is in the middle of the frame, so it doesn't count toward the 8 squares. Some pattern boards shade it anyway, but it makes no difference.
Which columns does the inside square use?
Only I, N and G: three squares each from I and G and two from N. Calls in the B and O columns can't help.
Keep reading
Outside Edge Bingo Pattern (Picture Frame): Rules, Odds & Tips
Outside edge bingo, or picture frame, covers all 16 border squares of the card. See exact odds by call, how long it takes, and where it fits in a session.
Sputnik Bingo Pattern: Rules, Odds & Tips
The sputnik bingo pattern is the small frame around the free space plus the four corners, like a satellite with antennas: 12 numbers. See the odds by call.
Nine Pack Bingo Pattern: Rules, Odds & Tips
The nine pack bingo pattern is a 3x3 block in any corner, always including the free space. See the 4 positions, the 8 numbers needed and exact odds.
Bingo Patterns
Every bingo pattern with a picture, rules and how many numbers you need.