Clues point to Half-Life: Alyx being more than than just a prequel

Wondering whether Half-Life: Alyx will only deal with events that happened before Half-Life 2? There are signs in the new trailer that point to it not just being a prequel.

Future of the Half-Life series - Combine OverWiki, the original Half-Life wiki and Portal wiki

Everything you need to know about the mysterious history of 'Half-Life 3': The game that never was

The Final Hours of Half-Life 2 - GameSpot

Valve secrets spill over—including Half-Life 3—in new Steam documentary app

The Final Hours of Half-Life 2 - GameSpot

Half-Life: Alyx - Top 10 Tips Before Playing - GameSpot

Half Life 3 Hinted at By Gabe Newell During a Valve Index Party, Sort of

Thoughts on Half-Life: Alyx and the narrative future of Half-Life – Jas writes stuff

Half-Life: Alyx: What we know about Valve's upcoming full-length VR game

Half-Life 3: The complete history of the greatest game never made - Essentials

Half-Life's remakes, de-makes and fan sequels show why Half-Life 3 was a no-go

Valve explains why it tried and failed to make multiple Half-Life 3s