스도쿠 16 퍼즐

★ Sudoku difficulty ratings.
(Provides maximum difficulty and total difficulty calculated based on Sudoku Explainer)
★ Step-by-step Sudoku
(Classified according to the Sudoku block size, and grades are given according to the solving record.)
★ Sudoku AI Battle
(If there is no input from the user for a certain period of time, AI will enter it automatically.)

[Supported block sizes]
★ 2x2 blocks (4 numbers)
★ 2x3 blocks (6 numbers)
★ 2x4 blocks (8 numbers)
★ 3x3 blocks (9 numbers)
★ 3x4 blocks (12 numbers)
★ 3x5 blocks (15 numbers)
★ 4x4 blocks (16 numbers)

[Supported Sudoku Types]
※ Sudoku types refer to 'Sudoku Variants Series' by Richard Stolk.
★ Basic Sudoku: This is the most common type of Sudoku.
★ Odd/Even Sudoku: You will be given a space where only odd (or even) numbers can be entered.
★ No-Touch Sudoku: You cannot enter the same number in diagonally adjacent squares.
★ Number bundle Sudoku: Only numbers within a certain range can be entered for all cells.
★ Diagonal Sudoku: The same number cannot be placed in two diagonal areas in the shape of an X.

[Notes]
★ If the blank ratio is set high, the creation time will increase.

[TODO]
★ Today's Sudoku Features
★ App gamification
(Various game items to be added)
★ Variant Sudoku support
★ etc.