There are several fighting games that qualify as cornerstone, but this title is the best edition of an already great title.

A free 3rd person shooter that is multiplayer and loaded with mucho action. Must play.

We are still playing this classic RTS today is a testament to its staying power 16 years later.

We don't need many more action RPG games, but Path of Exile has the depth that sets it apart from being a must own title.

Neverwinter is a fine example of how an MMO can be high quality fun and free to play.

The updated and definitive version of an FPS classic which is highly competitive.

A platforming rogue-like which is addictive, replayable, challenging, and gorgeous.

One of the cornerstones of modern rogue-likes. BoI:R is worth hundreds of hours of replayability.

The competitive monster MOBA that is constantly re-inventing iteself. This game keep MOBA fans on their toes.