HTMLify

const CONSTANT = {
    UNASSIGNED: 0,
    GRID_SIZE: 9,
    BOX_SIZE: 3,
    NUMBERS: [1,2,3,4,5,6,7,8,9],
    LEVEL_NAME: [
        'Easy',
        'Medium',
        'Hard',
        'Very hard',
        'Insane',
        'Inhuman'
    ],
    LEVEL: [29, 38, 47, 56, 65, 74]
}