Math and Logic

Four Corners

The goal of a 3×33\times 3 Calcdoku puzzle is to fill the squares with a single digit each, with the following rules:

  1. Each of the digits 11 through 33 is used exactly once in each row and column. (There is no region rule as in Sudoku.)

  2. Any marked region indicates a number and an operation (+,,×,(+,-,\times, or ÷).\div). The operation applies to digits in the region and, when applied to the digits in some order, they result in the given number. In the example below, the region marked 7+"“\, 7+" must be filled with three digits selected from 11 through 33 that have a sum of 7.7. Digits can be repeated in a marked region, but not in a row or column.

Keep reading to see two example puzzles, or jump straight to the daily challenge below.

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