Chopper simulator

[manveruppd]

Are there any flight sims where you can fly a helicopter on the market? Preferably a combat simulator, one that's structured around missions rather than a free-form flight sim. I remember when I was a kid playing all the Microprose flight sims (particularly F-19 and F-117A), but when I got the chopper one (was it called Gunship or something?) I found it much harder to control than th jet-based ones, so I'd like to give it another go!