'Half-Life 2' mod puts the sequel inside of the original
 

The chances of us getting Half-Life 3 or, hell, even Half-Life 2: Episode 3 seem about as likely as the Detroit Lions winning the Super Bowl at this point. To help take some of that sting off, a group of enterprising fans crafted Half-Life 2: Classic...

https://www.engadget.com/2017/09/18/...o-half-life-3/