About this game
Four Corners uses 75 balls and a 5×5 card with a free centre, with a 30-call limit. Any line counts, and so do the four corner squares together. The corners need just four numbers, and none of them relies on the free square.
💡 Tip: The four corners are also the ends of both diagonals, so every corner that is marked helps two patterns at once.
How to play
- Set your credits per round (default 5) — this is the cost of one card.
- Press CALL to draw one number at a time, or AUTO to let the calls run by themselves.
- Called numbers that appear on your card are marked automatically.
- Watch the call counter: the earlier a pattern is complete, the higher it pays (×20, ×6 or ×2).
- If the call limit is reached without a pattern, the round ends and a fresh card is ready.
The real numbers
75 balls, 30 calls, any line or the four corners: ×20 by call 10, ×6 by call 20, ×2 by call 30.
Because called balls are not put back, the chance that a particular number on your card is called equals calls ÷ balls: 30 ÷ 75 = 40% with 75 balls, 40 ÷ 90 ≈ 44% with 90, 32 ÷ 80 = 40% with 80 and 18 ÷ 30 = 60% with 30. A pattern needs all of its numbers, so the probabilities multiply (each adjusted slightly for the balls already used). A full five-number row on a 75-ball card is completed within 30 calls only about 0.83% of the time; a line through the free centre needs four numbers and reaches about 2.3%. A specific 90-ball row of five within 40 calls: about 1.5%. A specific three-number line on a 3×3 card when 18 of 30 balls are called: about 20%. A card holds many patterns, so the overall chance is higher than that of any single one.
Rules
Each round you receive a fresh card. Numbers are drawn at random, without repeats, from the full ball set — 30, 75, 80 or 90 balls depending on the game. Every called number that appears on your card is marked; on 75-ball cards the free centre square counts as already marked. You complete the round by covering one of the game's patterns: a line (any full row, column or diagonal), the four corners, or a stamp (any 2×2 block in a corner of the card). On 90-ball cards the goal is to fill any one of the three rows. The earlier you finish, the higher the multiple: first third of the call limit ×20, second third ×6, final third ×2. If the limit arrives first, the round is lost.
History
Number-calling games began in Italy, where Lo Giuoco del Lotto d'Italia was organised from 1530 and is still drawn today. In the 18th century the French turned it into Le Lotto, a parlour game with printed cards of rows and columns and numbered tokens pulled from a bag. In 19th-century Germany similar cards were used in classrooms to teach spelling, multiplication and history. In the United States the format became "Beano", played at travelling fairs with dried beans as markers. In 1929 the New York toy salesman Edwin S. Lowe saw it near Jacksonville, Georgia, and sold it nationwide as bingo. In the United Kingdom the 90-ball version with three-row tickets filled community halls from the 1960s onward.
Where it is popular today
Call & Mark games are easy to learn and pleasant to share. There is no strategy to master: every number has exactly the same chance of being called, so newcomers and veterans stand on equal footing. The rhythm of the calls creates gentle suspense, and British halls grew a whole tradition of nicknames for numbers, such as "legs eleven" for 11 or "two little ducks" for 22. Short rounds, clear patterns and a visible call limit also make the format ideal for learning basic probability.
Beginner’s guide
Start with a small card and a short game: the 30-ball versions with a 3×3 card end after at most 18 calls and show results quickly. Keep the credits per round at the default 5 while you learn — a ×2 finish then returns 10 credits and a ×20 finish returns 100. Use single CALL presses at first so you can follow which numbers are marked and which patterns are getting close. Every draw is independent of earlier rounds: no number is ever "due". The credits are virtual and free; when you have had enough, simply stop.
Did you know?
- A 75-ball card has 24 numbers plus a free centre square.
- A 90-ball card holds 15 numbers: five in each of its three rows.
- The Italian lotto tradition dates back to 1530.
- Early American players marked their cards with dried beans, which is where the name "Beano" came from.