When it comes to online games there are many different ways to measure success. Games can be praised for their good looks, engaging story and how long they have been around. But one metric matters above all others: the number of people playing.
And while there are many online games, there are not many with a player base that numbers in the millions. Some that do, such as World of Warcraft, get talked about all the time. But there are others that have managed to amass millions of dedicated fans without that attendant hoopla.
One such is Runescape - an online fantasy role-playing game created by British firm Jagex that has been running since 2001.