This game is way to hard & not fun. It has a password system, 11 rounds in this game. When you beat the game the 1st time you have to replay a 2nd quest repeating all the 11 rounds. This is impossible to beat. You have limited ammo, a limited life bar, Enemies get progressively harder to the point where if you don't use a Game Genie code for unlimited lives, ammo, invincibility, this game won't be beat. I rented this when I was kid, only got to like the 3rd level.