K.O. Sudoku - Sudoku Solver

Various types sudoku puzzles, answers, step-by-step explanations, allow take photo to input.
It supports 4/6/8/9/12/16 grid sudoku, jigsaw sudoku, killer sudoku, kendoku, balanced sudoku, odd/even sudoku, compdoku, consecutive sudoku, 3D sudoku, samurai sudoku, flower sudoku, windmill sudoku, gattai sudoku, butterfly sudoku, cross sudoku, twodoku, triple doku, sohei sudoku, diagonal sudoku, percent sudoku, window sudoku, asterisk sudoku, girandola sudoku, center dot sudoku, offset sudoku, etc.
There are also technique tutorials and a rich online sudoku store.
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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.