After 20 years, World of Warcraft will now let players do solo raids

After 20 years, it's now possible for solo players to finish storylines in the massively multiplayer online role-playing game World of Warcraft that previously required a group to do an intensive raid.

That's thanks to "Story Mode," a new raid difficulty that was added for the final wing of the first raid of the recently released The War Within expansion.

Over the years, developer Blizzard has expanded the difficulty options for raids to meet various players and communities where they're at in terms of play styles. The top difficulty is Mythic, where the semi-pro hardcore guilds compete. Below that is Heroic, where serious, capital-G gamers coordinate with friends in weekly raid schedules to progress. Then there's Normal, which still requires some coordination but isn't nearly as challenging and can typically be completed by a pick-up group within a few tries.