Sudoku: Dark

Features Sudoku: Dark

Sudoku: Dark is a one-rule puzzle game that can be either satisfyingly simple or deceptively difficult.
Puzzles have four difficulty levels: easy , medium , hard, and expert!
Choose any level you like!How to play sudoku?- Sudoku puzzle consists of a grid of 9 blocks.- Each block contains 3 rows and 3 columns grid.- Some grids are pre-filled with numbers, which cannot be changed.- The objective is to fill all the grids with 1 to 9 numbers, and each column, each row, and each of block contains only one of each digit.FEATRURES：- Free to play- No time limited- Turn on the pen mode to take notes like paper.
Each time you fill in a cell, the notes update automatically!- Four different difficulties- Unique solution for each puzzle- Highlight cells which are in same row, column and block.