Yeah. Tiger Heli is probably the hardest game to beat. I never thought of games like that. I played Tiger Heli through about two hours straight one time, though I knew it was unbeatable after I came up with the same conclusion previously.

Now that I think about it. Galaga could be considered the most well known hardest game. Not only is Galaga a very hard game regardless, but it may possibly have an ending just no one is good enough to get to it?