J1: the cliff tunnel (seam, six propped stretches, dark, lights), travel Valley <-> Cove through the sea cave, a save file per worldlet; New World has no Where (--dev-worldlets to try others)

scripts/world/tunnel_spot.gd

@@ -0,0 +1,35 @@
+extends StaticBody3D
+## Something to press E on in or by the cliff tunnel (tunnel.gd): the
+## seam's doorway ("in"), the way out at the top ("out"), the mouth of a
+## stretch that needs propping ("prop", stretch k), and the sea cave's
+## mouth ("cave"). On the interactables layer, so you walk through it.
+
+var tunnel: Node3D
+var what := ""
+var k := 0
+
+func interact_prompt(player: Node) -> String:
+	match what:
+		"in":
+			return "[E] Go down into the tunnel"
+		"out":
+			return "[E] Climb out onto the clifftop"
+		"prop":
+			var have: int = player.inventory.count("wood")
+			return "Unpropped: [E] Set a timber prop (%d wood, you have %d)" % [tunnel.PROP_WOOD, have]
+		"cave":
+			return "The sea cave: walk on out to the %s" % Terrain.worldlet_name(tunnel.to)
+	return ""
+
+func interact(player: Node) -> void:
+	match what:
+		"in":
+			tunnel.go_in(player)
+		"out":
+			tunnel.go_out(player)
+		"prop":
+			tunnel.set_prop(player, k)
+		"cave":
+			tunnel.world.travel(tunnel.to, "sea_cave")
+
+const Terrain = preload("res://scripts/world/terrain.gd")