Valve has a few reasons why Half-Life 2: Episode 3 never happened

Valve has explained why we never got Half-Life 2: Episode 3.

Will Valve Ever Release a Half-Life 3? Ten Years After Its First Announcement, Signs Point to No - The Atlantic

Half-Life 3 – the game that doesn't exist, Games

In 1 Box, 3 New Games Filled With Puzzles and Fights - The New York Times

Why Valve Never Made Half-Life 2: Episode 3 - IGN

Valve Explains Why Half-Life 3 and Left 4 Dead 3 Were Canceled

It's been 10 years since Valve announced Half-Life 2: Episode 3, but will it ever become a reality?

The making of Half-Life 2: Valve takes us behind the scenes of its narrative masterpiece

Half-Life 2, Episode 3 The Closure released news - ModDB

Half-Life 2: Episode 3 released in the worst form imaginable

Valve: Half-Life games are technical achievements, not just games

Half-Life 2: Episode Three, Half-Life Wiki

Valve never made Half-Life 2: Episode 3 because it was never really that happy with it