The "v0.4.1c Extra" version specifically marked a point where more narrative depth and character interactions were introduced, setting the stage for the increasingly complex relationships found in later updates. If you'd like, I can provide more on: Hidden location hints for any of the Books of Sin
The core of this update is roughly 45–60 minutes of additional gameplay loop. The "Extra" moniker specifically refers to a new side-story scenario that runs parallel to the main narrative. Without spoiling too much: Midnight Sin -v0.4.1c Extra- -Prodolzaetsa-