Pennsylvania gamers might have to pay a little extra for Mature-rated titles like Mortal Kombat or Grand Theft Auto. State lawmakers have proposed a 10 percent 'sin tax' on video games rated 'M' for Mature or 'AO' for adults-only. Republican State Rep. Christopher Quinn says violent video games can lead to real-life violence and wants to put the extra tax revenue towards increased school safety. A previous version of the bill was introduced last year but failed to get out of committee.