Game requires you to have fun and not really worry too much about clicking settings to make sure your engine runs, that you have the correct Magnetic Compass reading, the heading you have is correct, the distance you have to travel....it's just fly, shoot, fly, shoot and maybe land a little - WoP
Sim means you have to worry about every item above including the fun Fly and Shoot bit, ammunition running, the weather, FM, DM, bailing out, all things that Simulate real-life environments - IL2
One is Fun, the other is Fun with benefits