void AssignMines()
{
unminedTiles = new List <TileModel>(allTiles);
minedTiles = new List <TileModel>();
for (int assigned = 0; assigned < numberOfMines; ++assigned)
{
TileModel currentTile = (TileModel)unminedTiles[Random.Range(0, unminedTiles.Count)];
currentTile.GetComponent <TileModel>().isMined = true;
minedTiles.Add(currentTile);
unminedTiles.Remove(currentTile);
}
}