Quick answerThe Yellow Tower route unlocks the Tunnels. A useful guide must show the approach, route order, unlock confirmation and both travel endpoints.
Yellow Tower route
- Find the correct approach and entrance.
- Complete each regional interaction in sequence.
- Use the key cutters and confirm the Tunnels unlock.
Navigation checklist
- Capture the entrance landmark.
- Capture the exit landmark.
- Add both points to the main map and explain the return route.
Spoiler control
- Keep the route summary visible; place exact puzzle actions below a clear spoiler heading.
Source policy
Facts on this page are separated from community observations. Platform support and core features are checked against the official site, Steam store and official FAQ; locations and puzzle actions require a current-version in-game replay before they are presented as definitive.