Quick answer: Green Tower progression opens the chairlift route. It is especially helpful for mountain travel and for revisiting high-ground puzzle areas.
Before you begin
Bring a communication tool if players may separate vertically. Agree on a landmark and a meeting point before anyone rides ahead.
Route checklist
Collect rewards near the tower; complete the tower progression; follow the key route carefully; use the prepared key at the chairlift destination.
After the unlock
Record both ends of the chairlift; combine it with map landmarks; use it for high-ground exploration rather than guessing a walking route each time.
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.