They will obsess over the game, choose it over food, sleep, and social interaction.

WARNING! DON'T BUY THIS GAME FOR YOUR FRIENDS. THEY WILL OBSESS OVER THE GAME, CHOOSE IT OVER FOOD, SLEEP, AND SOCIAL INTERACTION. THEY WILL ALSO RETREAT INTO THEIR CAVES STROKE THEIR DESKTOP LOVINGLY AND START MUMBLING THINGS ABOUT FILTHY HOBBITSES AND PRECIOUSES.

99/10 Would turn best friend into Gollum again.