When it comes to a particularly good game, what matters most? I'm not talking about the old checklist videogame reviewers used to rely on -- and often still do -- such as music, graphics, presentation, etc. What I'm getting at here are the qualities which make a game stand above the rest in our collective minds. I've boiled it down to five particular areas in which I think a game needs to nail down in order to be more than the sum of its parts.