Which game mode should I play?
Arcade Reality  Infinite Shooter  Asteroids Mode  

Overview  Shooting game where the precision gets awarded. Every 5th level is a bonus level with unique goal or a boss character to defeat using nonstandard methods.  Shoot everything that moves.  Fly a little spaceship killing asteroids and occasional aliens. Unlike the classic, it requires the perfect orientation in 3D.  
Difficulty level  Medium  Easy  Hard  
Perspective  First Person  First Person  Third Person  
Game structure  Player is given 3 minutes for the whole game. In each regular level you lose some time for the game and win some bonus seconds (see Special scoring below). By maintaining the positive balance you can play for quite long before running out of time. Every 5th level is a bonus level where you can win powerups or extra time by completing a special mission 
Single play, no levels  Unlimited number of uniform levels (having the increasing number of asteroids)  
Level goal  Regular levels: 1.Destroy all aliens. 2.Using the least possible time 3.Using the least possible number of shots Bonus levels: various 
Destroy as many aliens as possible  Destroy all asteroids  
Special scoring  Player is awarded bonus seconds after completing the regular level with shooting efficiency of at least 40% (calculated as "hits / fires")

Combo bonus (the score for a hit is multiplied x2, x3, x4, etc)  for killing an alien within 2 seconds since the previous kill  Time bonus for completing a level. The amount of points is in proportion to the time taken (within some limits), e.g. you get 2x points for completing the level 2x faster  
Game over condition  Timeout  10 aliens escape through the triangular "portal"  Losing all ships  
Powerups  Can be won in bonus levels (various conditions)  Acquired by shooting the box  Picked up after destroying the asteroid or alien. Bonus ship after every 5000 points. 