PowerShell script Hangman game

Question

I am trying to develop the hangman game in PowerShell. All goes well in my script but there is an logical error in the game. I want to put the check, that when user enter the same word twice. It simple gives error ! For example : The Word "Football". If user enter Letter 'F' more then 1 times it should give error message. Here is my code :

$random = Get-Random -Minimum 0 -Maximum 5;
$names="America","Iran","Poland","Cat","PowerShell ";
$arrname= $names[$random];
$arrname.ToCharArray();
$ntp="0","1";
$arrlen = $arrname.Length;
clear;

Write-Host "---------Guess the word--------------";

Write-Host "Length is  : " $arrname.Length;
$life=3;
do{
Write-Host "Lifes Remain " $life;
$rnd= Read-Host "Guess the   word ";

if($flag2 -le 1)
{
 $flag=0;
}
else
{
$life--;
}  
for($i=0;$i -lt $arrname.Length; $i++)
{

if($rnd -eq $arrname[$i] )
{
$flag =1;
$arrlen --;
}
}
if($flag -eq 0 )
{

$life--;

}

if($arrlen -eq 0)
{

Write-Host  $arrname;
Write-Host " ************  You WIN  ********************";
break;

}

if($life -eq 0)
{
Write-Host " ------------- You LOST ------------"
break;
}
$p++;
}
while(1); 

Answer 1

Here you go, this should get you well on your way, to keep track of the letters add them to an array $guesses=@() then check if they have already used a letter using contains the letter $guesses -contains $guessLetter

$random = Get-Random -Minimum 0 -Maximum 5;
$names="America","Iran","Poland","Cat","PowerShell";
$targetWord = $names[$random];
[Char[]]$wordProgress =  "_" * $targetWord.Length
clear;

Write-Host "---------Guess the word--------------";

$life=3;
$guesses=@()
do
{
    do
    {
        Write-Host "[$($targetWord.Length)] $wordProgress";
        Write-Host "Lifes Remain " $life

        $guessLetter = Read-Host "Guess a letter:"
        if ($guesses -contains $guessLetter)
        {
            "Try another letter!"
        }
    } while ($guesses -contains $guessLetter) 

    $guesses+=$guessLetter
    $guesses -join ','

    $foundLetter = $false
    for($i=0;$i -lt $targetWord.Length; $i++)
    {
        if($guessLetter -like $targetWord[$i] )
        {
            $wordProgress[$i] = $guessLetter
            $foundLetter=$true
        }
    }

    if(!$foundLetter)
    {
        $life--;
    }

    if($($wordProgress -join '') -like $targetWord)
    {
        Write-Host $targetWord;
        Write-Host " ************  You WIN  ********************";
        break;
    }

}
while($life -gt 0)
if ($life -eq 0)
{
Write-Host " ------------- You LOST ------------"
}