Close counts.
Faster too.

Every round has ten questions. Multiplication has two one-digit × four-digit, two two-digit × three-digit, three two-digit × two-digit, two one-digit × up-to-three-digit questions and one square (11²–99²), shuffled. No operand appears in more than two questions. Products stay at or below 9,999, excluding 10, 100 and 1,000 as operands. Division reverses the same balanced factor pairs and always has an integer answer.

Squares has ten n × n questions: two distinct numbers from 11–19, and one from each of 21–29, 31–39, 41–49, 51–59, 61–69, 71–79, 81–89 and 91–99. Multiples of ten are excluded and the round is shuffled. Timer and practice rules are the same, with separate Squares PBs (sv1, sv2, sv3 and svp).

Addition + keeps the original two-addend game: one of each digit-length combination, with an extra two-digit pair instead of a one-digit pair. Addends are at least 6 and totals stay at or below 9,999. Addition ++ has three addends, each with two, three or four digits. Every round includes one of each of the ten unordered digit-length combinations, with addends and questions shuffled. Totals stay at or below 9,999. The two Addition challenges have separate PBs; Addition ++ uses ++v1, ++v2, ++v3 and ++vp. Subtraction uses its own balanced mix: the number subtracted and the answer both have at least two digits, and the starting number stays at or below 9,999. Each round has one question from each of nine larger digit-length categories and one from a combined pool of the four smallest categories. Questions are selected uniformly within their pool and shuffled.

Actual accuracy = 100 × min(estimate, answer) / max(estimate, answer). Only exact answers display 100.0%. Timed accuracy points = max(0, 2 × actual accuracy − 100): 50% or less earns 0 points, 90% earns 80, and 100% earns 100. The table and graph keep showing actual accuracy.

The time factor is 100% through two seconds, then falls linearly towards 80% just before your 10-, 20- or 30-second deadline. At the deadline it drops immediately to 0%; you may still answer. Individual score = accuracy points × time factor. Overall score = the average of the ten individual answer scores, using unrounded values. An answer in The Ditch contributes zero, even after a Bloop correction. There is no root adjustment. In v1 an exact answer at six seconds earns 90 points, the same as 95% actual accuracy at two seconds. The timer turns bold amber at 80% of the deadline, and red at the deadline.

Practice has no cutoff or speed penalty: scores and PBs use average accuracy only. Total time is shown and saved, excluding feedback pauses. Practice PB summaries show the time taken in the best-scoring round. Each operation/time combination has a separate PB saved in this browser across app updates. PB messages start after the second completed round in that mode. Bloops count towards PBs; Undo restores the previous score. Optional ×10, ÷10 or ÷100 corrections require at least 80% corrected accuracy and a 40-point improvement. Timing stays the same.