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HTML 

              
                doctype html
html(ng-app="sudoku")
  head
  body
    .sudoku(ng-controller="sudokuController as su" pos="0" ng-cloak)
      .box(ng-repeat="i in su.nine")
        .cell(ng-repeat="j in su.nine" contenteditable ng-model="su.array[su.boxmap[i*9+j]]")
      button(ng-click="su.go()") answer
      button(ng-click="su.reset()") reset

    .sudoku(ng-controller="sudokuController as su" pos="1" ng-cloak)
      .box(ng-repeat="i in su.nine")
        .cell(ng-repeat="j in su.nine" contenteditable ng-model="su.array[su.boxmap[i*9+j]]")
      button(ng-click="su.go()") answer
      button(ng-click="su.reset()") reset

    .sudoku(ng-controller="sudokuController as su" pos="3" ng-cloak)
      .box(ng-repeat="i in su.nine")
        .cell(ng-repeat="j in su.nine" contenteditable ng-model="su.array[su.boxmap[i*9+j]]")
      button(ng-click="su.go()") answer
      button(ng-click="su.reset()") reset
!

CSS 

              
                $len: 25px
$llen: ($len + 2) * 3
$lllen: ($llen + 2) * 3
div
  border: black solid 1px
  font-size: 18px
  text-align: center
  float: left
.sudoku
  width: $lllen
  height: $lllen
  margin-right: 10px
.box
  width: $llen
  height: $llen
  .cell
    width: $len
    height: $len

.ng-valid.ng-dirty
  color: green
.ng-invalid.ng-dirty
  color: red
!

JS 

              
                sudokus = [
  [
    8, '', '', '', '', '', '', '', ''
    '', '', 3, 6, '', '', '', '', ''
    '', 7, '', '', 9, '', 2, '', ''
    '', 5, '', '', '', 7, '', '', ''
    '', '', '', '', 4, 5, 7, '', ''
    '', '', '', 1, '', '', '', 3, ''
    '', '', 1, '', '', '', '', 6, 8
    '', '', 8, 5, '', '', '', 1, ''
    '', 9, '', '', '', '', 4, '', ''
  ]
  [
    '', '', '', 7, '', '', '', '', 2
    '', 3, '', '', '', 8, '', '', ''
    4, '', '', 5, '', '', 3, '', ''
    '', '', 7, 2, '', '', '', '', 1
    '', 1, '', '', '', '', '', 6, ''
    8, '', '', '', '', 7, 4, '', ''
    '', '', 1, '', '', 9, '', '', 5
    '', '', '', 6, '', '', '', 2, ''
    9, '', '', '', '', 3, '', '', ''
  ]
  [
    '', 9, 7, 4, '', '', '', '', ''
    4, '', '', '', '', 7, '', 3, ''
    3, '', '', '', '', '', '', '', ''
    8, '', '', 5, '', 9, '', 1, ''
    '', '', '', '', '', '', '', '', ''
    '', 7, '', 1, '', 6, '', '', 8
    '', '', 2, '', '', '', '', '', 6
    '', 1, '', 6, '', '', '', '', 2
    '', '', '', '', '', 5, 3, 8, ''
  ]
  [
    6, '', '', 5, '', '', 3, '', 1
    '', 9, '', '', '', '', '', '', ''
    '', '', 7, '', '', 8, 9, '', 4
    8, '', '', '', '', 1, 5, '', ''
    '', '', '', '', '', '', '', '', ''
    '', '', 4, 9, '', '', '', '', 2
    3, '', 5, 1, '', '', 6, '', ''
    '', '', '', '', '', '', '', 1, ''
    2, '', 1, '', '', 4, '', '', 7
  ]
]
app = angular.module 'sudoku', []
app.directive 'contenteditable', ->
  restrict: 'A'
  require: '?ngModel'
  link: (scope, ele, attrs, ngmodel) ->
    b = scope.$parent.i
    j = scope.j % 3 + b % 3 * 3
    i = scope.j // 3 + b // 3 * 3
    array = scope.$parent.$parent.su.array
    boxmap = scope.$parent.$parent.su.boxmap
    ngmodel.$render = ->
      ele.text ngmodel.$viewValue || ''
      ngmodel.$setValidity '', true
      ngmodel.$setViewValue ngmodel.$viewValue if not ngmodel.$viewValue

    ngmodel.$parsers.push (v) ->
      ngmodel.$setValidity '',
        v is '' or
        /^[1-9]$/.test(v) and
        not(1 for x in array[i*9..i*9+8] when x is v).length and
        not(1 for x in array[j..80] by 9 when x is v).length and
        not(1 for x in boxmap[b*9..b*9+8] when array[x] is v).length
      if ngmodel.$valid then v else NaN
    ele.on 'keyup change', -> ngmodel.$setViewValue parseInt ele.text()
    null

app.controller 'sudokuController', ($attrs) ->
  @array = sudokus[$attrs.pos][..]

  @boxmap = [
    0, 1, 2, 9, 10, 11, 18, 19, 20
    3, 4, 5, 12, 13, 14, 21, 22, 23
    6, 7, 8, 15, 16, 17, 24, 25, 26
    27, 28, 29, 36, 37, 38, 45, 46, 47
    30, 31, 32, 39, 40, 41, 48, 49, 50
    33, 34, 35, 42, 43, 44, 51, 52, 53
    54, 55, 56, 63, 64, 65, 72, 73, 74
    57, 58, 59, 66, 67, 68, 75, 76, 77
    60, 61, 62, 69, 70, 71, 78, 79, 80
  ]

  @getbox = (index) -> (@array[i] for i in @boxmap[index*9..index*9+8])

  @nine = [0..8]
  
  @reset = =>
    @array[i] = sudokus[$attrs.pos][i] for i in [0..80]
    null
  
  @go = ->
    @array[i] = '' for i in [0..80] when isNaN @array[i]
    @brute @next 0
    console.log @array
    
  @brute = (pos) ->
    if pos > 80
      return null
    origin = @array.slice 0
    if @hasslot()
      nominees = @available pos
      if nominees is []
        @array = origin
      else
        for nominee in nominees
          if @hasslot()
            @array = origin
            @array[pos] = nominee
            # await new Promise((r) -> setTimeout(r, 1000))
            @brute @next pos + 1
          else return
    
  @next = (pos) ->
    if @array[pos] is '' or pos > 80 then pos else @next pos + 1
    
  @available = (pos) ->
    x = pos % 9
    y = pos // 9
    row = (i for i in @array[y*9..y*9+8])
    col = (@array[i] for i in [x..80] by 9)
    box = @getbox x // 3 + y // 3 * 3
    _.difference [1..9], _.union(row, col, box)
    
  @hasslot = ->
    '' in @array
  null
!
999px

Console