Splinter Cell is not a trial and error game.
If it is for you, then you are simply impatient. If you pay attention and take your time, you can get through every mission without dying. Its very hard, but its possible.
But if you want to run from room to room making noise and not paying attention to everything you hear and see, then you'll be trapped in trial and error hell. Don't blame a game for your shortcomings as a gamer.
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