/// <summary>
/// Instantiates an enemy and puts him in the level.
/// </summary>
private Tile LoadSpikeTile(int x, int y)
{
Vector2 position = RectangleExtensions.GetBottomCenter(GetBounds(x, y));
spikes.Add(new Spike(this, position));
return(new Tile(null, TileCollision.Passable));
}