Sorry, didn't mean to accuse you of anything. Like patio says, it's best to respect their wishes. If someone did something on your computer that you didn't approve of, I'm sure you wouldn't be too happy. Until you get a better setup for yourself, your best bet may be to talk with your parents try to get them to understand what the game is about. Might not work, but it's better than hiding something from them.
Out of curiosity, what game is this? I didn't see a name mentioned anywhere.