Mortal Kombat X may have been an instant global phenomenon, but Rome wasn't built in a day! A lot of hard work goes into making these games and it looks like the team at NetherRealm Studios have been burning the midnight oil!

Project Lead Ed Boon tweeted out a couple of pics last night: one of them the clock reading 2:50AM! That's either a seriously cryptic clue, or some serious dedication! He also shared an image of the office after dark -- and its that image that really has our attention!

We saw this clock/office combo eighteen months ago during hype for NetherRealm's last AAA fighting game: Injustice: Gods Among Us. Back then, it was all part of the teasers, revealing two of the final games' cameo background characters.

We'll leave the zoom, clean-up and reflection flipping to all you CSI-eyed Runners out there. With banners from most previous instalments in the Mortal Kombat series visible - we're wondering if the clues aren't hiding in plain sight.

The announce trailer shifted the tone of expectation to something more disconnected from Mortal Kombat (2011) and its lethal consequences. A press release promise for multiple playable versions of characters had us bandying around an internal speculative shorthand of "Greatest Hits" to describe what we think might be coming.

Interestingly enough, that same term has showed up on screenshots shared by @NetherRealm [enlarge thumbnails above]. Maybe it's just a playful reference to the hard hits of the trailer. Maybe we're barking up the wrong tree all together. Or, just maybe, the philosophy of Mortal Kombat X is already on show for all to see.

Check out our reveal trailer breakdown for more screenshots & speculation. Register to share your own crazy theories in the Mortal Kombat X forum!