plants vs. zombies addict

Blake has gotten a little addicted to playing on my iPhone, specifically Plants vs. Zombies.  He sneaks it away and turns down the volume so that he can hide and play without me knowing.  He will then forget it somewhere and we can't call it to find it because the volume is all the way down.

We have caught him trying to sneak the phone upstairs with the phone hidden up under his shirt but the screen on.  He nonchalantly walks right in front of us with a bright screen showing right through his shirt.

He says he likes to have the iPhone to play on because he says the can't win on the iPod, but on the iPhone he can.  We have put the iPhones as well as iPods on lockdown.