Escaping into another world

When I play video games I escape into a world that is already set for you. You play as the character, feeling frustrated angry when you cant seem to win the level. You get so immersed into the game the virtual reality seems to fade away and reality disappears.At this is the point when the game is no longer a game it become the alternate reality where you don't worry what goes on in real life. This is kind of scary having a dream like this but never waking up. This would be a nightmare not ever being able to snap out of a game. Its is a scary thought when you really get to think about it. Now imagine this what if when you played a first person shooter game that would really be you. If you died in the game you would really die in real life. At what point is a game no longer a game??