01_IntroValley opens the build zone list as intro valley, the starting area from which every other labelled zone in the game follows.

Build label
- 01_IntroValley
Adjacent labels
- 71_IntroRiver
Numbering notes
- No earlier zone label precedes it in the list.
- It comes directly before 02_WestCoastHeadlands (West Coast Headlands).
- The starting area group has 2 labels; 01_IntroValley is the first of them.
Evidence note: Intro Valley (01_IntroValley) is documented from release-build zone labels in Big Walk. This entry is based on a locally installed Steam release build (v1.4.7); scene/terrain/mesh labels inspected 2026-08-05; verified 2026-08-05.