Help cleaning script

[danny0]

I'm making a sudoku solving script strictly to learn from. So far, my script works, but it is very messy. If anyone could tidy it up a bit and add some comments as to what they did, I would be thankful.

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#include <GuiConstants.au3>
#include <Array.au3>

Dim $Box[5][5],$Input[17], $Row1Array[5], $Row2Array[5], $Row3Array[5], $Row4Array[5], $Column1Array[5], $Column2Array[5]
Dim $Column3Array[5], $Column4Array[5], $Cell1Array[5], $Cell2Array[5], $Cell3Array[5], $Cell4Array[5], $NRow1Array[1]
Dim $NRow2Array[1], $NRow3Array[1], $NRow4Array[1], $NColumn1Array[1], $NColumn2Array[1], $NColumn3Array[1], $NColumn4Array[1]
Dim $NCell1Array[1], $NCell2Array[1], $NCell3Array[1], $NCell4Array[1]

Opt("TrayIconDebug", 1)

$Form1 = GUICreate("Sudoku", 633, 447, 193, 125)
$Input[1] = GUICtrlCreateInput("", 128, 88, 30, 30)
$Input[2] = GUICtrlCreateInput("", 157, 88, 30, 30)
$Input[5] = GUICtrlCreateInput("", 128, 117, 30, 30)
$Input[6] = GUICtrlCreateInput("", 157, 117, 30, 30)
$Input[3] = GUICtrlCreateInput("", 200, 88, 30, 30)
$Input[4] = GUICtrlCreateInput("", 229, 88, 30, 30)
$Input[7] = GUICtrlCreateInput("", 200, 117, 30, 30)
$Input[8] = GUICtrlCreateInput("", 229, 117, 30, 30)
$Input[9] = GUICtrlCreateInput("", 128, 160, 30, 30)
$Input[10] = GUICtrlCreateInput("", 157, 160, 30, 30)
$Input[13] = GUICtrlCreateInput("", 128, 189, 30, 30)
$Input[14] = GUICtrlCreateInput("", 157, 189, 30, 30)
$Input[11] = GUICtrlCreateInput("", 200, 160, 30, 30)
$Input[12] = GUICtrlCreateInput("", 229, 160, 30, 30)
$Input[15] = GUICtrlCreateInput("", 200, 189, 30, 30)
$Input[16] = GUICtrlCreateInput("", 229, 189, 30, 30)
$Button1 = GUICtrlCreateButton("Auto", 152, 256, 65, 33, 0)
$a = 0
For $x = 1 To 16
    GUICtrlSetLimit($Input[$x], 1)
Next
GUISetState(@SW_SHOW)

While 1
    While 1
        $msg = GUIGetMsg()
        If $msg = $GUI_EVENT_CLOSE Then Exit
        If $msg = $Button1 Then
            Values()
            If Check() = 0 Then
                ExitLoop
            Else
                Solve()
            EndIf
        EndIf
    WEnd
WEnd
Func Values();write values in each box to an array
    $z = 0
    For $x = 1 To 4;row
        For $y = 1 To 4;column
            $z = $z+1
            $Box[$x][$y] = GUICtrlRead($Input[$z])
        Next
    Next
EndFunc
Func Check();Makes sure there isn't two numbers in a single row, box, or column
;value arrangement: topleft, topright, bottomleft, bottomright
    Dim $Row1Array[4] = [$Box[1][1], $Box[1][2], $Box[1][3], $Box[1][4]]
    For $x = 1 To 4
        $NRow1Array = _ArrayFindAll($Row1Array, $x)
        If UBound($NRow1Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into row 1")
            Return 0
        EndIf
    Next
    Dim $Row2Array[4] = [$Box[2][1], $Box[2][2], $Box[2][3], $Box[2][4]]
    For $x = 1 To 4
        $NRow2Array = _ArrayFindAll($Row2Array, $x)
        If UBound($NRow2Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into row 2")
            Return 0
        EndIf
    Next
    Dim $Row3Array[4] = [$Box[3][1], $Box[3][2], $Box[3][3], $Box[3][4]]
    For $x = 1 To 4
        $NRow3Array =  _ArrayFindAll($Row3Array, $x)
        If UBound($NRow3Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into row 3")
            Return 0
        EndIf
    Next
    Dim $Row4Array[4] = [$Box[4][1], $Box[4][2], $Box[4][3], $Box[4][4]]
    For $x = 1 To 4
        $NRow4Array =  _ArrayFindAll($Row4Array, $x)
        If UBound($NRow4Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into row 4")
            Return 0
        EndIf
    Next
    
    Dim $Column1Array[4] = [$Box[1][1], $Box[2][1], $Box[3][1], $Box[4][1]]
    For $x = 1 To 4
        $NColumn1Array =  _ArrayFindAll($Column1Array, $x)
        If UBound($NColumn1Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into column 1")
            Return 0
        EndIf
    Next
    Dim $Column2Array[4] = [$Box[1][2], $Box[2][2], $Box[3][2], $Box[4][2]]
    For $x = 1 To 4
        $NColumn2Array =  _ArrayFindAll($Column2Array, $x)
        If UBound($NColumn2Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into column 2")
            Return 0
        EndIf
    Next
    Dim $Column3Array[4] = [$Box[1][3], $Box[2][3], $Box[3][3], $Box[4][3]]
    For $x = 1 To 4
        $NColumn3Array =  _ArrayFindAll($Column3Array, $x)
        If UBound($NColumn3Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into column 3")
            Return 0
        EndIf
    Next
    Dim $Column4Array[4] = [$Box[1][4], $Box[2][4], $Box[3][4], $Box[4][4]]
    For $x = 1 To 4
        $NColumn4Array =  _ArrayFindAll($Column4Array, $x)
        If UBound($NColumn4Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into column 4")
            Return 0
        EndIf
    Next
    
    Dim $Cell1Array[4] = [$Box[1][1], $Box[1][2], $Box[2][1], $Box[2][2]]
    For $x = 1 To 4
        $NCell1Array =  _ArrayFindAll($Cell1Array, $x)
        If UBound($NCell1Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into cell 1")
            Return 0
        EndIf
    Next
    Dim $Cell2Array[4] = [$Box[1][3], $Box[1][4], $Box[2][3], $Box[2][4]]
    For $x = 1 To 4
        $NCell2Array =  _ArrayFindAll($Cell2Array, $x)
        If UBound($NCell2Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into cell 2")
            Return 0
        EndIf
    Next
    Dim $Cell3Array[4] = [$Box[3][1], $Box[3][2], $Box[4][1], $Box[4][2]]
    For $x = 1 To 4
        $NCell3Array =  _ArrayFindAll($Cell3Array, $x)
        If UBound($NCell3Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into cell 3")
            Return 0
        EndIf
    Next
    Dim $Cell4Array[4] = [$Box[3][3], $Box[3][4], $Box[4][3], $Box[4][4]]
    For $x = 1 To 4
        $NCell4Array =  _ArrayFindAll($Cell4Array, $x)
        If UBound($NCell4Array) > 1 Then
            MsgBox(0, "Error", "You have entered an invalid value into cell 4")
            Return 0
        EndIf
    Next
    Return 1
EndFunc
Func Solve();solves the puzzle
;progressing
EndFunc