Try guild wars. It's a bit different from RS, but it's very fun.
guild wars is awesome but expensive compared to runescape =/
hmm ive heard that diablo 3 is meant to be good try buying at from a shop or somthing?
World of warcraft really isn't anything like runescape but if you like runescape you will love world of warcraft =D
just a suggestion
Try guild wars. It's a bit different from RS, but it's very fun.

