Most guides tell you how to win. This exclusive feature tells you how to survive – and unlock the secrets the developer, Hans “Pixelsturm” Gruber , explicitly said "no one would ever find."
Certain puzzles are audio-based. In the 1999 forest scene, the correct path is indicated by a bird call that plays only on stereo headphones. If you hear a three-note whistle (G-A-C), turn right. A two-note whistle (F-D), turn left. unteralterbach 21 guide exclusive
The search results for "Unteralterbach 21 guide exclusive" indicate that this refers to a guide for the visual novel Unteralterbach Most guides tell you how to win