/// <summary>
/// Gets the empty tile neighbors.
/// </summary>
/// <param name="grid">IGrid object.</param>
/// <returns>A list of neighbors.</returns>
private IList<Tile> GetNeighbours(IGrid grid)
{
List<Tile> neighbourTiles = new List<Tile>();
foreach (Tile tile in grid)
{
bool isValidNeighbour = grid.CanSwap(tile);
if (isValidNeighbour)
{
neighbourTiles.Add(tile);
}
}
return neighbourTiles;
}