K.O. Sudoku Pro version. 1. Permanent ad-free; 2. Unlimited prompts; 3. Open full game store(for unlock types); 4. Cloud backup; 5. Early access to new features; ------------------------------ 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, irregular sudoku, killer sudoku, kendoku, skyscraper sudoku, snow sudoku, necklace sudoku, thermo sudoku , arrow sudoku, clone sudoku, blackout sudoku, odd/even sudoku, palindrome sudoku, little killer sudoku, direction sudoku, outside sudoku, x-sums sudoku, sum frame sudoku, OEBS sudoku, 3D sudoku, cube sudoku, samurai sudoku, flower sudoku, windmill sudoku, gattai sudoku, butterfly sudoku, cross sudoku, twodoku, triple doku, sohei sudoku, W sudoku, snow sudoku, hexagonal sudoku, inequality sudoku, fortress sudoku, odd-even minesweeper sudoku, slanted-lines sudoku, kropki sudoku, product sudoku, ratio sudoku, addition sudoku, VX sudoku, 56 sudoku, battenburg sudoku, quad max sudoku, exclusion sudoku, odd-even lines sudoku, anti-diagonal sudoku, consec-ineq sudoku, BMS sudoku, big-small sudoku, odd sudoku, even sudoku, connected irregular sudoku, add/sub sudoku, balanced sudoku, consecutive sudoku, non-consecutive sudoku, touchless sudoku, anti-knight sudoku, anti-bishop sudoku, no-four sudoku, diagonal sudoku, percent sudoku, window sudoku, asterisk sudoku, girandola sudoku, center dot sudoku, pyramid sudoku, offset sudoku, letter-map sudoku, etc. There are also technique tutorials and a rich online sudoku store. --------------- K.O. mode: Provide the solution directly. Help mode: Provide step-by-step explanations. --------------- Sudoku Rules: Fill in the 9x9 grid with numbers 1~9 such that each row, column, and 3x3 box contains each number exactly once. Irregular Sudoku: Each row, column, and irregularly shaped box contains no repeating digits. Killer Sudoku: Combines classic Sudoku rules with "killer cages" (dashed-line groups). Each cage shows a sum for its digits, which must also be unique within the cage. Kendoku (Newdoku/Calcudoku/Mathdoku): Fill an n x n grid with digits 1-n (no repeats per row/column). Groups marked by thick lines show a target number and operation (+, -, ×, ÷) that their digits must satisfy. If no operator is given, any operation applies. Skyscraper Sudoku: Perimeter clues showing visible building counts (taller numbers block smaller ones), while unmarked sides remain unrestricted. 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. Blackout 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 classic Sudoku rules in each of the five independent regions. Inequality Sudoku: 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. Diagonal Sudoku (X Sudoku): Requiring uniqueness of digits in two major diagonals.
