private void CreateWalls()
{
for (var x = 0; x < SideLength; x++)
{
field[x, 0] = Content.Wall;
field[x, SideLength - 1] = Content.Wall;
}
for (var y = 0; y < SideLength; y++)
{
field[0, y] = Content.Wall;
field[SideLength - 1, y] = Content.Wall;
}
}