Quick answer: This guide is for players who have completed the main ending or who explicitly want to prepare for the full completion route.
Before reading further
Make sure the regular group is ready for major spoilers. The main ending and full completion are not necessarily the same point in the journey.
Preparation checklist
Keep the host save available; record unfinished post-game puzzles; use the map and transport network before starting a broad completion sweep.
If the route does not progress
Review purple-puzzle progress; check uncollected rewards and missed unlocks; compare your group notes with the 100% checklist.
Source & update note
Core platform, player-count, crossplay and hosting facts are checked against the official Big Walk FAQ. This page uses spoiler-aware community route notes and should be rechecked after game updates.