If she does not accept this, then she is merely trying to force you to whatever ideal she has...not out of any love and/or respect she has towards you. She may threaten to leave you, or cause physical damage to your property IF this all is true (I would demand the key back in that case). Your name will also likely to be mud within her circle of girlfriends as she twists the story around.
To quote Sun Tzu: "You can ensure the safety of your defense if you only hold positions that cannot be attacked."
Do not accept, in any relationship, a request to change oneself for the sake of change alone. This is considered controlling and (mentally) abusive. If it is to self improve a known flaw, then do so wisely. If it an unknown but readily-agreed-upon flaw, then do so with aid. If it is a perceived flaw, then the flaw is overly-likely within the one perceiving said supposed flaw.
And yes, if the TC had stated "Boy friend making me sell my ps3...", I'd still say the same thing.
I'll tell you this TC, if you give up gaming and marry the woman, you'll be divorced within 5 years. She is either trying to control you, or she is trying to mold you into something you are not. This chick will make your life hell.
You should stash handhelds all over the house so you can still play games when she's not around. Or dump her. Unless you're going to bang her more, then don't dump her. Bang her until you're tired. Then dump her.
It's a nice idea, just one problem; she'll find them a lot quicker than finding his porn stash.
"I did 20 years of martial arts training in 10 years by skipping the discipline part so bring it!"