London Hide + Seek Boundary v2
Scale: Zone 1+2 minimum, with Zone 2+3 edge stations included.
Area: 195.0 km²   Perimeter: 59.2 km
Anchors: 103   KML vertices: 323   Covered checklist stations: 224

Binding rule: inside or on the red line is in bounds, subject to safety and public-access rules.
Road edge: red boundary road/bridge counts for transit/crossing; hiding must be public, safe, and inside/on the line.
Stations: travel/rendezvous only. No hiding behind barriers, platforms, trains, staff-only, or paid areas.
Use: import the KML into Google My Maps for play; this HTML is the offline-style preview.