not much of a tower def. type of guy....i like games where you move around....like ynth or squareball
SPiN is a hard game at the higher difficulty levels. It's designed to challenge the players to the limits of their recognition/reaction speeds. We've so far found one player in the world with Jedi-level reflexes. He informed us of a high score bug when the game went over ~5 billion points.
Harbor Havoc 3D Its like flight control only a lot harder. Its harder because there are different kinds of vehicals on the same stage. Like vehicals can only crash into like vehicals.
If hard = logic then [app]Marple[/app] and you can always give yourself just 3 minutes for a puzzle. Even harder? Do all of them
earthworm jim and lunarcy! earthworm jim is a run and gun platformer, lunarcy is an undescribable game where you dock your spaceship in the back of an tanker to get cargo, then land your spaceship onto the planet that you began on.
If you're competititive try Eliminate or Minigore. Minigore isn't extremely difficult but it can get really intense once you get into the high points, which makes trying to get on the leaderboards all the more fun.