If Angry Birds is Crush The Castle this is Hold Your Ground: http://www.physicsgames.net/game/Hold_Your_Ground.html http://www.physicsgames.net/game/Hold_Your_G

If Angry Birds is Crush The Castle this is Hold Your Ground: http://www.physicsgames.net/game/Hold_Your_Ground.html http://www.physicsgames.net/game/Hold_Your_Ground.html. Since Hold Your Ground has been out for years I am surprised someone hasn't done this before considering the runaway success of Angry Birds.