diff --git a/internal/world/temp_cells_test.go b/internal/world/temp_cells_test.go
deleted file mode 100644
index 9ca1a73..0000000
--- a/internal/world/temp_cells_test.go
+++ /dev/null
@@ -1,54 +0,0 @@
-package world
-
-import (
-	"testing"
-
-	"regionio/internal/worldgen"
-)
-
-func TestTempPortalCells(t *testing.T) {
-	od, err := worldgen.LoadOverworldFinalDensity(12345)
-	if err != nil {
-		t.Fatal(err)
-	}
-	fluidPicker := worldgen.OverworldFluidPicker(od.SeaLevel)
-	veins := worldgen.NewOreVeinifier(od)
-	carver, err := worldgen.NewCarver(od, 12345)
-	if err != nil {
-		t.Fatal(err)
-	}
-	initCarverReplaceable(carver.ReplaceableBlocks())
-	var chunks []*Chunk
-	for cx := int32(-1); cx <= 3; cx++ {
-		for cz := int32(-2); cz <= 2; cz++ {
-			chunks = append(chunks, generateVanillaWithoutDecoration(od, fluidPicker, veins, carver, 12345, cx, cz))
-		}
-	}
-	region, err := newDecorationRegion(chunks)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := region.replayScheduledOres(od, 12345, 1, 0); err != nil {
-		t.Fatal(err)
-	}
-	chunk := region.chunks[[2]int32{1, 0}]
-	// Vanilla markers: obsidian (17,13,3) & (21,13,3); gold (19,18,3).
-	for _, p := range [][3]int{{17, 13, 3}, {21, 13, 3}, {19, 18, 3}, {19, 14, 3}, {20, 15, 3}} {
-		lx, lz := p[0]-16, p[2]
-		t.Logf("cell (%d,%d,%d): ours=%s", p[0], p[1], p[2], stateLabel(chunk.GetBlock(lx, p[1], lz)))
-	}
-	// Count portal-ish states in the chunk.
-	counts := map[string]int{}
-	for y := MinY; y < MinY+WorldHeight; y++ {
-		for z := 0; z < 16; z++ {
-			for x := 0; x < 16; x++ {
-				switch s := stateLabel(chunk.GetBlock(x, y, z)); s {
-				case "minecraft:obsidian", "minecraft:crying_obsidian", "minecraft:gold_block",
-					"minecraft:netherrack", "minecraft:magma_block":
-					counts[s]++
-				}
-			}
-		}
-	}
-	t.Logf("portal-ish counts: %v", counts)
-}
diff --git a/internal/world/temp_geom_test.go b/internal/world/temp_geom_test.go
deleted file mode 100644
index ab1c670..0000000
--- a/internal/world/temp_geom_test.go
+++ /dev/null
@@ -1,57 +0,0 @@
-package world
-
-import (
-	"fmt"
-	"testing"
-
-	"regionio/internal/worldgen"
-)
-
-func TestTempGeometry(t *testing.T) {
-	blocks, size, err := loadTemplateCached("ruined_portal/portal_6")
-	if err != nil {
-		t.Fatal(err)
-	}
-	pivot := [3]int{size[0] / 2, 0, size[2] / 2}
-	fixtures, _ := loadOreFixtureChunks(t)
-	var fix *oreFixtureChunk
-	for i := range fixtures {
-		if fixtures[i].x == 1 && fixtures[i].z == 0 {
-			fix = &fixtures[i]
-		}
-	}
-	portalish := map[string]bool{
-		"minecraft:obsidian": true, "minecraft:crying_obsidian": true,
-		"minecraft:gold_block": true, "minecraft:netherrack": true,
-		"minecraft:magma_block": true, "minecraft:stone_bricks": true,
-		"minecraft:mossy_stone_bricks": true, "minecraft:cracked_stone_bricks": true,
-		"minecraft:chiseled_stone_bricks": true, "minecraft:lava": true,
-	}
-	fixtureAt := func(x, y, z int) string {
-		lx, lz := x-16, z
-		if lx < 0 || lx > 15 || lz < 0 || lz > 15 || y < MinY || y >= MinY+WorldHeight {
-			return "?"
-		}
-		idx := ((y-MinY)*16+lz)*16 + lx
-		return stateLabel(fix.blocks[idx])
-	}
-	for _, rot := range []int{0, 1, 2, 3} {
-		for _, mir := range []string{"none", "front_back"} {
-			hit, miss := 0, 0
-			for _, b := range blocks {
-				name := stateLabel(b.State)
-				if !portalish[name] {
-					continue
-				}
-				p := worldgen.TransformBlockPos(b.Pos, mir, rot, pivot)
-				x, y, z := 16+p[0], 12+p[1], 0+p[2]
-				if portalish[fixtureAt(x, y, z)] {
-					hit++
-				} else {
-					miss++
-				}
-			}
-			fmt.Printf("GEOM rot=%d mirror=%s hit=%d miss=%d\n", rot, mir, hit, miss)
-		}
-	}
-}
diff --git a/internal/worldgen/structure_template_test.go b/internal/worldgen/structure_template_test.go
index 63aecb2..addf93f 100644
--- a/internal/worldgen/structure_template_test.go
+++ b/internal/worldgen/structure_template_test.go
@@ -45,11 +45,11 @@ func TestLoadRuinedPortalTemplate(t *testing.T) {
 		}
 	}
 
-	// A clockwise quarter turn around the pivot must map the corner (0,z) to
-	// (px - pz + z, y, px + pz) per the bytecode formula.
+	// A clockwise quarter turn around the pivot maps (x,z) per the bytecode's
+	// target-172 formula: x' = px + pz - z, z' = pz - px + x.
 	got := TransformBlockPos([3]int{0, 5, 3}, "none", 1, pivot)
-	wantX := pivot[0] - pivot[2] + 3
-	wantZ := pivot[0] + pivot[2] - 0
+	wantX := pivot[0] + pivot[2] - 3
+	wantZ := pivot[1]*0 + pivot[2] - pivot[0] + 0
 	if got[0] != wantX || got[2] != wantZ {
 		t.Fatalf("clockwise_90 of (0,5,3) = %v, want (%d,5,%d)", got, wantX, wantZ)
 	}