Det er et af de sår, der aldrig rigtig heler i spilleverdenen. Half-Life 2's fik som nok efterhånden alle ved aldrig sin fortjente efterfølger, som så mange spillere havde håbet. Derfor ved vi heller ikke, hvad de forbandede aliens fra Xen egentlig ville eller hvem G-Man er!
Vi ved dog, at Valve ved flere lejligheder har arbejdet på spillet, og at en af spillets prototyper faktisk var et strategispil. Det blev afsløret af Andrew Reiner fra Game Informer i deres sidste afsnit af Best Theories. Her sagde han følgende:
"There were so many different prototypes being worked on by small teams of four or five people. It just never got off the ground. They said two of the directions they were going in: one was going to be an RTS game for Half Life 3 or Episode Three, whatever they were going to call it that changed the script. The other involved live actors. It was going to be a new kind of adventure action game with actual actors. Kind of like Night Trap, but far advanced. Apparently they were working on these things."
Av av, en smule salt i det stadigt åbne sår. Hvis du stadig har lyst til at se afsnittet, kan du gøre det her.