ExZeus, from HyperDevbox Japan, is a 3-D shoot 'em up port of the coin-op arcade game. It's a shooter-on-rails similar in game play and concept to Space Harrier, another old-school favorite. Iron Man, which has been in the App Store for several weeks, is yet another take on the traditional shooter-on-rails game.
There's no fussing around with the genre: All you do is fly dead ahead, blast everything that gets in your way, grab power ups and try not to crash into anything.
The plot is that the council of ExZeus wants to reclaim Earth from invading aliens and has deployed three flying robots: Sophia, Calista and Dynamis. Each has a unique combination of speed, power, weaponry and armor. Choose your robot, make it to the end of the first level, kill the boss and up you go four more levels. You'll confront a dozen kinds of enemies using missiles, mega-laser and bombs. With ExZeus you have five lives on each level and once you die, you have to start all over.
Use motion control (which you can calibrate in Options) to maneuver through the level. Tap on the right side of the screen to fire, hold the fire button on the right to fire a mega-laser and tap on the left to lock on a target. Swiping from the right corner to the left corner lets loose a bomb; swiping in the opposite direction pauses the game.
In ExZeus you're also able to adjust the volume of the music and SFX (no surprise), reverse the controls, reverse the fire button and calibrate tilt control.
ExZeus, which has been ported to a number of other platforms, has an old-style arcade game look and feel. It's decades old. Even so, the graphics are impressive. They're not as polished as those of some apps and that's a good thing for nostalgists who have dropped rolls and rolls of quarters into arcade machines playing games similar to this one.