This is a game I have fond memories of. I played the DOS CD Rom version to completion (probably on easy). I just remember the very posh English voice over, especially when the mission is over "Let's get out of here". I remember that keeping points over per round, meant that you had a bit of "credit" if you were surprised when the enemy suddenly was sighted - that is, you get an opportunity to shoot first etc. I can imagine the interface is very clunky by today's standards - but back in the day, "standards" were looser and you had more patience with GUI quirks as you bought a game a played it "to death".