Mind LoftSudoku · Marked sudokus

Free jigsaw, windoku, arrow, anti-knight and palindrome sudoku

5 games · a new board in each every day · no signup

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QuiltJigsaw sudokuCrooked-region sudokuThe nine boxes have been redrawn into nine crooked regions. Every row, column and region still holds one through nine exactly once.Play
WindowWindokuSudoku with four windowsAn ordinary sudoku plus four shaded windows: each window, a 3x3 block set between the boxes, also holds 1 to 9 once. Rows, columns and boxes still do too, and the windows do enough of the work that the board prints very few digits.Play
ArrowArrow sudokuThe daily arrow sudokuAn ordinary sudoku plus arrows: each arrow runs from a circle through a short line of squares, and the digit in the circle is the total of the digits along its line. Sundays print just eight digits under twelve arrows.Play
KnightAnti-knight sudokuThe anti-knight sudokuAn ordinary sudoku plus one rule: a digit may not repeat anywhere a chess knight could jump to it, two squares one way and one square across. Nothing is drawn on the grid, the rule reaches across boxes instead of inside them, and the board prints far fewer digits than a sudoku usually needs.Play
RacecarPalindrome sudokuPalindrome-line sudokuAn ordinary sudoku plus grey lines that read the same from either end, so the two end squares of every line match, then the next two in. Rows, columns and boxes still hold 1 to 9 once.Play

How the marked sudokus play

Five sudokus where the grid itself carries the extra rule. Quilt redraws the boxes as crooked regions. Window shades four extra boxes that also hold 1 to 9. Arrow runs lines out of circles, and each circle holds the total of the digits along its line. Knight forbids two of the same digit a chess knight’s move apart. Racecar draws lines that read the same from either end.

Quilt and Window are the gentlest steps into variants: Quilt only reshapes the boxes, and Window adds four more of them. Arrow adds small sums. Racecar pairs squares off from the ends of each line inward, so a digit found at one end is found at the other. Knight keeps every classic rule and adds one: no digit may repeat a knight’s move away.

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All five, every day, no account required.