Back almost 6 years ago, I created a TXT file with detailed instructions on how to get to the IQ Virtual Bar and fight Blackthorne -- well, the in-game Blackthorne, not the real one (after all, he's a heck of guy!). I also gathered/included various clues that folks had given here on the IA forums back in the day.
Even though (1.) some of these are quite obscure, with people not really knowing even where or how to look for some of the tasks/answers here in 2021, and (2.) despite the fact that the game has been out now for almost 7 years, Blackthorne and Klytos still might not be too happy if we just spilled the beans to everyone.
Who knows? Perhaps enough time has passed that they may not have a problem with it. If they give us the go ahead, I'll post my guide, but until then...

In fact, I think Klytos had mentioned over the last year or two that one Easter egg has still not been discovered.