* This is a 1st person shooter action game, which you fight against aliens invading the space station on Mars.
* Complete missions as you fight against aliens and explore around the maze-like space station.
As you level up, the space station becomes more and more of a complex maze, and the aliens get stronger and more various.
* 30 types of aliens attack the space station in different ways.
The aliens attack with guns and knives. Some of them keep chasing you, and some jump on you.
There are aliens that block the players attacks with their shield, and some attack at long range.
Especially, the boss has even greater health and stronger attack damage.
* With level-ups, you can obtain cartridges (or magazines) for new weapons as a bonus.
Wandering around the space station, you can restore your health with healing items that you find on the floor.
* The player fight with 8 kinds of weapons against the various aliens.
1) Handgun : The most basic attacks.
2) Laser gun : You can attack rapidly, and the laser beam enables you to aim the targets precisely.
3) Flame-thrower : You project a stream of fire, only at close range.
4) Grenade : You attack all the aliens within the range of grenade. The grenades are useful when you are hiding behind a corner and want to attack the enemy on the other side.
5) Machine gun : You can keep firing the gun with the fastest speed.
6) Plasma gun : You can do a powerful range attack that damages all the aliens within the range.
7) Rocket launcher : You can do a range attack that hits all the aliens within the range. It is the most powerful, but it takes some time to reload.
8) Knife : You attack enemies at close range.
* The game has two separate endings.
It depends on the choice of player on the final level.
* Nanum font is used in this game supplied by Naver.