private Game()
{
_entitySource = new GameEntitySource();
_entityPool = new GameEntityPool(_entitySource);
_tileProperties = new GameTilePropertiesSource();
_respawnTracker = new GameEntityRespawnTracker();
stageFactory = new StageFactory(_entityPool, _respawnTracker);
_stateMachine = new GameStateMachine(_entityPool, stageFactory);
}