From a 2019 forum post by Hans Gruber (translated):
"I made UA21 because I wanted to see how far I could push the visual novel format before it collapsed into pure bureaucracy. The tractor scene was written in one night after I drank an entire crate of Fassbrause. No, I will not explain the pretzel curse. And yes, the Excel spreadsheet is actually functional. You can do your real taxes in it. One player did and got a refund. That is canon." unteralterbach 21 guide exclusive
Before we break the game open, a quick primer. Unteralterbach 21 is the pseudo-sequel/remake of the cult classic Unteralterbach. The premise is ridiculous: You are a middle-aged IT consultant from Nuremberg who inherits a house in the tiny fictional village of Unteralterbach. Upon arrival, you discover a quantum rift in the basement that sends you back to 1999. Your goal? Navigate both the past and present timelines to prevent a village-wide catastrophe involving a rogue tractor, a stolen sausage recipe, and a pop idol wannabe. From a 2019 forum post by Hans Gruber (translated):
Why an exclusive guide?
The game has no built-in hints. Dialogue choices are permanent. Miss a single item in 1999, and you cannot return until a New Game+. This guide assumes you want the Platinum Experience—all endings, all CGs, and the secret bonus chapter. "I made UA21 because I wanted to see
Exclusive Tip: Keep a physical notebook. The game will not track your past actions for you. Write down who you talked to in 1999, or you will forget the order by hour two.