Ghost Walker is a 3D action game about a ninja assassin, where you have to fight against various enemies, such as soldiers, guns, and other ninjas. You can also find a lot of items, such as swords, spears, guns, axes, and other weapons. The enemies will not be easy to defeat, as they will be shooting at you, and you will have to use various skills to dodge their bullets. 

If you can defeat all the enemies, then you can proceed to the next floor. However, if you get hit by the bullets, you will lose a life. You can also try to reach the higher floors by defeating the enemies.