Why can't return the variable?

[ConsoleReadLine]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AmiralBattı
{
class Program
{
static void Main(string[] args)
{
bool gameContinues = true;

while (gameContinues == true)
{
try
{
Console.Write("Enter a number in 0 to 8 range: ");
int choice = Convert.ToInt32(Console.ReadLine());
Console.WriteLine(Game(choice));
}
catch
{
Console.WriteLine("Wrong type input.");
}

}
Console.ReadLine();
}

static int Game(int choice)
{
int ships;

switch (choice)
{
case 0:
ships = 12345678;
break;
case 1:
ships = 02345678;
break;
case 2:
ships = 01345678;
break;
case 3:
ships = 01245678;
break;
case 4:
ships = 01235678;
break;
case 5:
ships = 01234678;
break;
case 6:
ships = 01234578;
break;
case 7:
ships = 01234568;
break;
case 8:
ships = 01234567;
break;
default:
Console.WriteLine("Invalid number");
break;

}
return ships;
}

}


Use of unassigned local variable 'ships' error kicks when I run the program.

View: https://www.youtube.com/watch?v=GhQdlIFylQ8
in the video, at 2:24:30, Mike is able to initiate his program with same code line I have.

I am confused and I seek help from the Microsoft Comunity.

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