Easy, Medium, Hard levels gets the job done.
I like the way MMOs do things though. There, one size HAS to fit all. You can do basic questing which caters to the C-grade gamers, and offers you most of the games content, and is for the most part an entertaining experience (if a little annoying if you just want to power through to the level cap).
But there are side games you can to do that boost the challenge. You can solo a certain wandering boss mob maybe, or there is there pvp you can do, or maybe run instances at lower levels than usual (hopefully without being an impediment to your party). Or craft a rare piece of gear, or be the richest person in your guild, or level the fastest, or whatever.
In other words, set the basic game at easy, and then have medium, hard, and very hard optional side games, that reward you with some gear or some trinket you can use to show off your leetness.
I like the way MMOs do things though. There, one size HAS to fit all. You can do basic questing which caters to the C-grade gamers, and offers you most of the games content, and is for the most part an entertaining experience (if a little annoying if you just want to power through to the level cap).
But there are side games you can to do that boost the challenge. You can solo a certain wandering boss mob maybe, or there is there pvp you can do, or maybe run instances at lower levels than usual (hopefully without being an impediment to your party). Or craft a rare piece of gear, or be the richest person in your guild, or level the fastest, or whatever.
In other words, set the basic game at easy, and then have medium, hard, and very hard optional side games, that reward you with some gear or some trinket you can use to show off your leetness.