# How To Solve Calcudoku Puzzles

The puzzle consists of a grid containing blocks outlined by bold lines.

Fill all empty squares with numbers from 1 to N, where N is the grid's number of rows or columns. Each number can appear only once in each row and column, and the numbers in each block produce the result of the math operation (+ addition, - subtraction, x multiplication, and / division) shown in the top-left corner of the block. A number may be used more than once in the same block but not in the same row or column. ## Calcudoku Puzzle

Here is a typical Calcudoku puzzle grid. The grid size can be smaller or larger and varies in difficulty.

The grid contains empty squares outlined by bold lines to form blocks. Each clock includes a math operation and a number which is the answer to the operation. In the example above, the first block comprises three squares in an "L" formation, and the clue of 180x means the three numbers in the cells must multiply to 180.

Like Sudoku, each number can appear only once in any row or column. However, a number may be used more than once in the same block. ## Calcudoku Solution

The solution to the puzzle is shown here.

Notice how each row and column contains each number (in this puzzle, from 1 to 7) with no duplication. Also, notice that each block satisfies the mathematical operation required. For example, the first block on the top left requires an answer of 180 by multiplying the three numbers. Multiplying 6,5, and 6 equals 180.