Great Game among the best for its time.
You will find yourself saving your progress again and again throughout the game. Some sections will take several times to play before you are able to master them and advance to the next section. The sniper vision was the first of its kind and really gives the game a great punch. Being able to see your enemy from miles away and nail them right between the eyes is very gratifying.
Additional levels through an expansion pack would have been nice, but this was before the days of extra levels being added by programmers for almost every game that is out there.
Some of the levels are a bit confusing and can be frustrating because if you don’t them exactly right you will not level up. But overall this game is a classic and it rocks.