A called number flashes for 1.5 seconds — find it on your 5×5 card and tap before it disappears. 60 calls, maximum 12 lines.
A number is called at the top with a shrinking timer bar. Find that number in your 5×5 card (columns are B 1–15, I 16–30, N 31–45, G 46–60, O 61–75) and tap the cell before the bar runs out. Each successful mark earns 5 points; each completed line (row, column, or diagonal) is +100. The center is a FREE square, already marked. The game ends after 60 calls.
Memorize column anchors before the first call. The B column has the smallest numbers, O the largest — when you hear a high number, your eyes should already be moving right. Spending the first two seconds before any call to scan your card top-to-bottom by column lets you respond to early calls reflexively instead of searching.
Prioritize lines that share cells. After your first row or column, every other line that intersects it now needs only four more marks instead of five. The diagonal through the FREE center plus the row and column through it form a star that gives you three lines for the cost of two — focus your taps on numbers that complete that star first.
Don't tap blind on near-misses. Tapping the wrong cell wastes nothing but your time — yet that time is the whole game. If you're not sure whether 47 is in the G column you're scanning, skip it and keep scanning until you visually lock on. A confirmed miss costs zero points; a panicked wrong tap costs the remainder of the call window.
The timer bar lies a little. Reaction studies put recognition time at 200–300 ms, so a 1500 ms call really gives you about 1200 ms of useful search. Plan to start scanning the moment the number renders, not the moment your brain finishes processing the letter prefix — the B/I/N/G/O hint tells you only the column, which is faster information than the digits themselves.