I've actually given this some thought as I've kinda taken Gaming as a religion anyway. Here's how I see it working:
In Gamer's Hell you must live thru EVERY game you've ever played for more than 5 minutes. Demos don't count. "Played" is defined as actually playing the game (i.e. moving the character, shooting, etc) therefore watching a 10 minute MGS intro wont count until you spend 5 mins sneaking around as Snake snapping necks (or Raiden, you get the picture).
You have all the abilities of the character you play in the game as well as all your memories from playing the game whilst you were alive. You are subject to all the rules within the game however you can perform normal abilities as you would in real life (i.e. jumping, leaning, crouching, etc.) You must successfully complete the game in order to progress to the next game. The games will be given to you in random order despite the order you may have played them in, however games in linear succession (ex. God of War 1 2 & 3) will be played from beginning to end. I've always imagined a "Wheel of Fortune" type device to determine the next game.
Games without real endings will require you to reach a certain point value (think Pacman, Galaga, Frogger, etc) before ending the game. Games with multiple characters or party members (ex. Final Fantasy) can act as they would in game or if you prefer, have the embodiment of a friend inhabit that body. This friend, if still alive, will experience the game with you as they dream. There is no time in Gamer's Hell, so several weeks in-game can pass in a single night to one of the living. You can have them stay or go as you please.
Completion of Gamer's Hell allows you to experience any game you choose whenever you like and can leave the game whenever as well. You can even have access to games not yet created at the time you died as there is no time in Gamer's Hell.
I know this doesn't sound too bad, but imagine having to not only play but LIVE thru games like Resident Evil, Fatal Frame or *shudder* Silent Hill. And it's EVERY game you've played. From PC to Console to Handheld. Scary huh?