Valve is celebrating Left 4 Dead 2's 15th birthday by making it free-to-play this weekend, alongside a massive Steam sale at the same time.

Players looking to challenge themselves against an "inescapable" room will find these games perfect to pit their minds ...

As part of a full-blown 20th anniversary sale, Valve's landmark title is free to add to your PC library all weekend.

Playing a survival game with VR can be an exhilarating experience, and here are some of the best titles available.