That's a very hard question, however, a game that I can relate to makes me want to play a game more. A game that gives rewards also makes me want more of it. A game that is both challenging, yet easy is also a factor for me. The incorporation of music, well good music, is also a factor. Lastly, the realism factor. If I can't relate to a character or make a character in a game relate to my liking, then the game is not for me. In closing, these are the x-factors a game needs to get me addicted. Now, does your game have the X-Addict-Factor?
Byron Reeves: What Makes a Game Addictive?