MathDoku
MathDoku
MathDoku is a math puzzle similar to Sudoku. Your goal is to correctly fill the entire square field with numbers. Fields come in varying sizes: from 3×3 to 9×9. To fill a cell, select it (using a keyboard or mouse), then select the number. You can type the number from the keyboard or use the panel buttons. A number can be replaced at any time. Like Sudoku, you can only use each number once per row and once per column. Numbers can be from 1 to the puzzle size (1 to 5 for a 5×5 puzzle). Each puzzle only has one correct solution. Groups of cells are separated from each other by thick lines. These are segments. Segments of just one cell are there to give you a good start: you can just fill them outright. Each segment has a target number in its leftmost upper corner, and an operator next to it: sum (+), deduction (-), division (÷) or multiplication (x). Numbers within the segment, when subjected to that operator, must give exactly the target number. 4+ means that the sum of the numbers must be 4 (like 3+1), and 2- means that their difference is 2 (like 3-1). 6x means a multiplication producing 6 (like 2×3), and 2÷ means their division gives 2 (like 2÷1). Feel free to use the built-in calculator. To turn it on and off, click the calculator button (or use the C hotkey). Click or tap a segment and the calculator will show the result for the filled numbers (left block) and then show how much To leave notes on which numbers you think can be put into a cell, use the NOTES button (N hotkey). While active, inputting a number will put (or remove, if already there) smaller notes in the cell. Clicking the ERASER button (hotkey Delete or E) clears the cell. If stuck, you can use help. REVEAL option (R hotkey) gives a choice of showing the correct answer for a single cell, the entire segment, or the entire puzzle. HINT button (H hotkey) highlights all the incorrect numbers entered so far. If everything is correct, it will Reveal one of the empty cells instead.
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