From the title screen, click on "Play" to start the game. Once on the screen, toss shurikens at the enemies to increase your score. Every 400 points, your belt rank will go up, the enemies will attack even faster, and you'll see a power-up appear on the screen. If you are hit once, either by a Ranx soldier, or the fireball, you will die and the game is over. You must submit your score to continue.