➀ Rockstar's PS3 exclusive 'Agent' was cancelled after over a decade of development; ➁ Co-founder Dan Houser reveals the game never left the early stages and was never properly developed; ➂ Houser suggests that the film-inspired story did not translate well into a video game format.

➀ Valve showcases gameplay from the canceled Half-Life 2: Episode 3 in a documentary celebrating the game's 20th anniversary; ➁ The gameplay reveals an Arctic setting with a new Ice Gun and Alyx as a key character; ➂ The documentary discusses the game's development and the reasons for its cancellation.