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This is another Sudoku game with 4 levels of difficulty. The principle of Sudoku is to fill all squares with numbers from 1 to 9 without repeating the same number in the same raw, column or 3x3 square.
Online room escape game. Your aim is to escape the room. To do that you need to open the door, but the door is secure, very secure, it has 10 locks on it. To open the door you will need to find 10 keys.
Synchronizing......