K.O. Sudoku - Sudoku Solver 4+

Sudoku game, tutorials, take photo to get answer / step-by-step explanations

Various types sudoku puzzles, answers, step-by-step explanations, allow take photo to input.
It supports 3/4/5/6/7/8/9/10/12/15/16 grid sudoku, jigsaw sudoku, killer sudoku, kendoku, skyscraper sudoku, snow sudoku, necklace sudoku, thermo sudoku
, arrow sudoku, clone sudoku, missing one sudoku, odd/even sudoku, palindrome sudoku, little killer sudoku, direction sudoku, sum frame sudoku, 3D sudoku, samurai sudoku, flower sudoku, windmill sudoku, gattai sudoku, butterfly sudoku, cross sudoku, twodoku, triple doku, sohei sudoku, snow sudoku, compdoku, fortress sudoku, slanted-lines sudoku, kropki sudoku, product sudoku, ratio sudoku, sum sudoku, VX sudoku, 56 sudoku, exclusion sudoku, big-small sudoku, odd sudoku, even sudoku, balanced sudoku, consecutive sudoku, non-consecutive sudoku, touchless sudoku, anti-knight sudoku, diagonal sudoku, percent sudoku, window sudoku, asterisk sudoku, girandola sudoku, center dot sudoku, pyramid sudoku, offset sudoku, etc.
There are also technique tutorials and a rich online sudoku store.
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K.O. mode: Provide the solution directly.
Help mode: Provide step-by-step explanations.
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Sudoku Rules: Fill in the 9x9 grid with numbers 1~9 such that each row, column, and 3x3 box contains each number exactly once.
Jigsaw Sudoku: Each row, column, and irregularly shaped box contains no repeating digits.
Killer Sudoku: The number on the dashed line signifies the sum of the digits within the corresponding cage, and the digits within the cage must be unique.
Kendoku (Newdoku/Calcudoku/Mathdoku): No digit is repeated in each row or column. Additionally, the number and arithmetic symbol (+-×÷) located at the top left of each group represent the answer obtained by performing the specified operation on the digits within that group. If no operator is specified, it means this group can use any of the above operators.
Skyscraper Sudoku: External clues that indicate the number of visible buildings from each direction (taller buildings block shorter ones, i.e., larger numbers obscure smaller numbers). Unmarked directions have no restrictions.
Snow Sudoku: No digit repeats in any horizontal row, left diagonal, right diagonal direction, or within each hexagon.
Necklace Sudoku: The numbers in each row, each column, and each necklace (an area formed by multiple connected circles) are all non-repetitive.
Thermo Sudoku: Numbers must strictly increase from the round bulb end to the flat end of each thermometer shape.
Arrow Sudoku: The number in the circle equals the sum of all numbers along its arrow path.
Clone Sudoku: Using colors to mark multiple identically-shaped clone regions, where numbers in corresponding positions across clone regions must match.
Missing One Sudoku: Each row, column, and box must contain unique numbers, but black cells remain empty without digits.
Odd / Even Sudoku: Cells with circles must contain odd digits, cells with squares must contain even digits.
3D Sudoku: Each 3x3 box, as well as the 9 cells along each colored line, contain unique, non-repeating digits.
Samurai Sudoku: Satisfying the standard Sudoku rules in each of the five independent regions.
Compdoku: Adds symbols such as great than, and the numbers must satisfy the corresponding size relationships.
Fortress Sudoku: Gray fortress cells must contain numbers larger than adjacent white cells.
Kropki Sudoku: Kropki Sudoku: Black dot - ratio of 2; White dot - differ by 1; Others - not satisfy either of these two relationships.
Product Sudoku: The small numbers marked on the grid indicate the product of the two adjacent cells.
Sum Sudoku: The small numbers marked on the grid indicate the sum of the two/four adjacent cells.
Diagonal Sudoku (X Sudoku): Adds to standard rules by requiring uniqueness of digits in two major diagonals.