diff --git a/Bundle Packs/index.json b/Bundle Packs/index.json
index 18048e3..db4ca90 100644
--- a/Bundle Packs/index.json	
+++ b/Bundle Packs/index.json	
@@ -529,7 +529,7 @@
                                                 {
                                                   "id": "26_1_2",
                                                   "minVersion": "26.1.2",
-                                                  "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/greek_mythology.mcsave?checksum=184741d1889f2a348caacc8963ed635d"
+                                                  "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/greek_mythology.mcsave?checksum=f865d1fae2187f79cfa0cf7e373d564a"
                                                 }
                                               ]
                                           },
@@ -566,7 +566,7 @@
                                                 {
                                                   "id": "26_1_2",
                                                   "minVersion": "26.1.2",
-                                                  "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/chinese_mythology.mcsave?checksum=3d0f069e94574b18413bd2fded48f8c5"
+                                                  "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/chinese_mythology.mcsave?checksum=64382d0c595870d977209b2c497dcb2e"
                                                 }
                                               ]
                                           }
@@ -598,7 +598,7 @@
               {
                 "id": "26_1_2",
                 "minVersion": "26.1.2",
-                "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/festive.mcsave?checksum=57a5cd0cc2be85c8dedeb5b125d11b5b"
+                "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/festive.mcsave?checksum=9b2d120155413669a2f2f2b68e8933a9"
               }
             ],
             "bundlePacks": [
@@ -652,7 +652,7 @@
               {
                 "id": "26_1_2",
                 "minVersion": "26.1.2",
-                "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/halloween.mcsave?checksum=e943c5dd44ff16a8d3fa9819534ff2bd"
+                "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/halloween.mcsave?checksum=cc540b15aa52e14a9eb02167b4dc69ce"
               }
             ],
             "bundlePacks": [
diff --git a/mashup_packs/index.json b/mashup_packs/index.json
index 7bb512c..17c7564 100644
--- a/mashup_packs/index.json
+++ b/mashup_packs/index.json
@@ -12,7 +12,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/pirates_of_the_caribbean.mcsave?checksum=ca976c1efcc50b2cce4d852ac2db9e2f"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/pirates_of_the_caribbean.mcsave?checksum=59889701117c9b7481f33123d0e576ac"
         }
       ],
       "bundlePacks": [
@@ -43,7 +43,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/egyptian_mythology.mcsave?checksum=dcc3ac8075742e43aca29970a3f4a7cb"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/egyptian_mythology.mcsave?checksum=2d551fd170095908c40d5b5285854171"
         }
       ],
       "bundlePacks": [
@@ -74,7 +74,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/norse_mythology.mcsave?checksum=ddfe0a2669ecf056493668cf547b4320"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/norse_mythology.mcsave?checksum=c87536dd770a1860719e0ff33508cc52"
         }
       ],
       "bundlePacks": [
@@ -105,7 +105,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/festive.mcsave?checksum=57a5cd0cc2be85c8dedeb5b125d11b5b"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/festive.mcsave?checksum=9b2d120155413669a2f2f2b68e8933a9"
         }
       ],
       "bundlePacks": [
@@ -136,7 +136,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/chinese_mythology.mcsave?checksum=3d0f069e94574b18413bd2fded48f8c5"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/chinese_mythology.mcsave?checksum=64382d0c595870d977209b2c497dcb2e"
         }
       ],
       "bundlePacks": [
@@ -167,7 +167,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/greek_mythology.mcsave?checksum=184741d1889f2a348caacc8963ed635d"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/greek_mythology.mcsave?checksum=f865d1fae2187f79cfa0cf7e373d564a"
         }
       ],
       "bundlePacks": [
@@ -191,7 +191,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/fallout.mcsave?checksum=7d9b0ff2483086dcbebc7256afcc40bd"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/fallout.mcsave?checksum=ccc2623a36912cf2ba62b3112b820747"
         }
       ],
       "bundlePacks": [
@@ -215,7 +215,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/mass_effect.mcsave?checksum=a1d7f9148df30d16e826ceff3e89d2ea"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/mass_effect.mcsave?checksum=af228b71a741c9305d3611dbb5f88bd1"
         }
       ],
       "bundlePacks": [
@@ -235,6 +235,13 @@
       "imageUrl": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/mashup_packs/preview_images/lbp_preview.png?checksum=123ec1874432e218c6307a57e08cac85",
       "worldTemplateDownloadURI": "https://github.com/BrandonItaly/LCE-Resources/raw/50525107964bd8589f7534c9470f4a1b21ea9087/world_templates/littlebigplanet.mcsave?checksum=03e9e06ff9792cc971cb44cdbbdab9a7",
       "worldTemplateFolderName": "LittleBigPlanet Mash-up",
+      "worldTemplateVariants": [
+        {
+          "id": "26_1_2",
+          "minVersion": "26.1.2",
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/littlebigplanet.mcsave?checksum=c45a5914a8f635d889bf3c0ca2ebf2a8"
+        }
+      ],
       "bundlePacks": [
         {
           "categoryId": "skinpacks",
@@ -263,7 +270,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/halloween.mcsave?checksum=e943c5dd44ff16a8d3fa9819534ff2bd"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/halloween.mcsave?checksum=cc540b15aa52e14a9eb02167b4dc69ce"
         }
       ],
       "bundlePacks": [
@@ -294,7 +301,7 @@
         {
           "id": "26_1_2",
           "minVersion": "26.1.2",
-          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26_1_2/super_mario.mcsave?checksum=b4602f1848343ef902ed6a6959d733e3"
+          "downloadURI": "https://raw.githubusercontent.com/creeper2eletricboogaloo/L4JDownloadableContent/main/world_templates/26%2B/super_mario.mcsave?checksum=2758bca53ad1d84acfe514cbb9d3b18b"
         }
       ],
       "bundlePacks": [
diff --git a/scripts/make_bundle_preview.py b/scripts/make_bundle_preview.py
index ee42fca..8a3d7b8 100644
--- a/scripts/make_bundle_preview.py
+++ b/scripts/make_bundle_preview.py
@@ -156,7 +156,7 @@ def second_row_names(bundle_dir: Path) -> list[str] | None:
 def main() -> int:
     parser = argparse.ArgumentParser()
     parser.add_argument("--base", default="cropped_bundle_clean.png")
-    parser.add_argument("--header", default="header.png")
+    parser.add_argument("--header", default="../preview logos/header.png")
     parser.add_argument("--bundle-dir")
     parser.add_argument("--output-name", default="preview.png")
     parser.add_argument("--no-header", action="store_true")
diff --git a/scripts/update_links.py b/scripts/update_links.py
index f02745e..7fa0c6b 100644
--- a/scripts/update_links.py
+++ b/scripts/update_links.py
@@ -413,6 +413,23 @@ def build_changes(root: Path, refs: list[UrlRef], config: dict) -> tuple[list[Ch
     return changes, sorted(set(additions), key=lambda item: (item.rel_file, item.path, item.order, item.variant_id)), config_additions, sorted(set(warnings))
 
 
+def build_local_changes(root: Path, refs: list[UrlRef]) -> tuple[list[Change], list[str]]:
+    changes: list[Change] = []
+    warnings: list[str] = []
+    for ref in refs:
+        rel_parts = parse_same_repo_raw(ref.value)
+        if rel_parts is None:
+            continue
+        local_path = root.joinpath(*rel_parts)
+        if not local_path.exists():
+            warnings.append(f"Missing local file for {ref.rel_file} {ref.path}: {'/'.join(rel_parts)}")
+            continue
+        new_url = raw_url_for(rel_parts, md5_file(local_path))
+        if new_url != ref.value:
+            changes.append(Change("local", ref.rel_file, ref.path, ref.value, new_url))
+    return changes, sorted(set(warnings))
+
+
 def replacement_token(value: str) -> str:
     return json.dumps(value, ensure_ascii=False)
 
@@ -792,18 +809,24 @@ def main() -> int:
     mode = parser.add_mutually_exclusive_group(required=True)
     mode.add_argument("--check", action="store_true")
     mode.add_argument("--write", action="store_true")
+    parser.add_argument("--local-only", action="store_true", help="Only update same-repository raw GitHub checksum URLs.")
     args = parser.parse_args()
     root = repo_root()
-    config = load_config(root)
     texts, _, refs = load_json_files(root)
-    changes, additions, config_additions, warnings = build_changes(root, refs, config)
+    if args.local_only:
+        changes, warnings = build_local_changes(root, refs)
+        additions: list[VariantAddition] = []
+        config_additions: list[ConfigTrackAddition] = []
+    else:
+        config = load_config(root)
+        changes, additions, config_additions, warnings = build_changes(root, refs, config)
     if args.write and (changes or additions or config_additions):
         errors = write_changes(root, texts, changes, additions)
         if errors:
             for error in errors:
                 print(error, file=sys.stderr)
             return 2
-        if config_additions:
+        if not args.local_only and config_additions:
             write_config_tracks(root, config, config_additions)
     print_report(changes, additions, config_additions, warnings, args.write and bool(changes or additions or config_additions))
     return 0
diff --git a/world_templates/1.20+/adventure_time.mcsave b/world_templates/1.20+/adventure_time.mcsave
new file mode 100644
index 0000000..7555d3b
Binary files /dev/null and b/world_templates/1.20+/adventure_time.mcsave differ
diff --git a/world_templates/1.20+/chinese_mythology.mcsave b/world_templates/1.20+/chinese_mythology.mcsave
new file mode 100644
index 0000000..dbabd44
Binary files /dev/null and b/world_templates/1.20+/chinese_mythology.mcsave differ
diff --git a/world_templates/1.20+/egyptian_mythology.mcsave b/world_templates/1.20+/egyptian_mythology.mcsave
new file mode 100644
index 0000000..a225966
Binary files /dev/null and b/world_templates/1.20+/egyptian_mythology.mcsave differ
diff --git a/world_templates/1.20+/fallout.mcsave b/world_templates/1.20+/fallout.mcsave
new file mode 100644
index 0000000..1e3d467
Binary files /dev/null and b/world_templates/1.20+/fallout.mcsave differ
diff --git a/world_templates/1.20+/festive.mcsave b/world_templates/1.20+/festive.mcsave
new file mode 100644
index 0000000..91b8ee7
Binary files /dev/null and b/world_templates/1.20+/festive.mcsave differ
diff --git a/world_templates/1.20+/greek_mythology.mcsave b/world_templates/1.20+/greek_mythology.mcsave
new file mode 100644
index 0000000..5dddef0
Binary files /dev/null and b/world_templates/1.20+/greek_mythology.mcsave differ
diff --git a/world_templates/1.20+/halloween.mcsave b/world_templates/1.20+/halloween.mcsave
new file mode 100644
index 0000000..40e6b92
Binary files /dev/null and b/world_templates/1.20+/halloween.mcsave differ
diff --git a/world_templates/1.20+/halo.mcsave b/world_templates/1.20+/halo.mcsave
new file mode 100644
index 0000000..6d246ef
Binary files /dev/null and b/world_templates/1.20+/halo.mcsave differ
diff --git a/world_templates/1.20+/littlebigplanet.mcsave b/world_templates/1.20+/littlebigplanet.mcsave
new file mode 100644
index 0000000..5c84564
Binary files /dev/null and b/world_templates/1.20+/littlebigplanet.mcsave differ
diff --git a/world_templates/1.20+/mass_effect.mcsave b/world_templates/1.20+/mass_effect.mcsave
new file mode 100644
index 0000000..2497438
Binary files /dev/null and b/world_templates/1.20+/mass_effect.mcsave differ
diff --git a/world_templates/1.20+/norse_mythology.mcsave b/world_templates/1.20+/norse_mythology.mcsave
new file mode 100644
index 0000000..53370a4
Binary files /dev/null and b/world_templates/1.20+/norse_mythology.mcsave differ
diff --git a/world_templates/1.20+/pirates_of_the_caribbean.mcsave b/world_templates/1.20+/pirates_of_the_caribbean.mcsave
new file mode 100644
index 0000000..506f3f0
Binary files /dev/null and b/world_templates/1.20+/pirates_of_the_caribbean.mcsave differ
diff --git a/world_templates/1.20+/skyrim.mcsave b/world_templates/1.20+/skyrim.mcsave
new file mode 100644
index 0000000..685dd9b
Binary files /dev/null and b/world_templates/1.20+/skyrim.mcsave differ
diff --git a/world_templates/1.20+/steven_universe.mcsave b/world_templates/1.20+/steven_universe.mcsave
new file mode 100644
index 0000000..9c4684a
Binary files /dev/null and b/world_templates/1.20+/steven_universe.mcsave differ
diff --git a/world_templates/1.20+/super_mario.mcsave b/world_templates/1.20+/super_mario.mcsave
new file mode 100644
index 0000000..1875ba5
Binary files /dev/null and b/world_templates/1.20+/super_mario.mcsave differ
diff --git a/world_templates/1.20+/the_nightmare_before_christmas.mcsave b/world_templates/1.20+/the_nightmare_before_christmas.mcsave
new file mode 100644
index 0000000..41e46f7
Binary files /dev/null and b/world_templates/1.20+/the_nightmare_before_christmas.mcsave differ
diff --git a/world_templates/1.20+/toy_story.mcsave b/world_templates/1.20+/toy_story.mcsave
new file mode 100644
index 0000000..c932d6c
Binary files /dev/null and b/world_templates/1.20+/toy_story.mcsave differ
diff --git a/world_templates/26+/adventure_time.mcsave b/world_templates/26+/adventure_time.mcsave
new file mode 100644
index 0000000..82169a2
Binary files /dev/null and b/world_templates/26+/adventure_time.mcsave differ
diff --git a/world_templates/26+/chinese_mythology.mcsave b/world_templates/26+/chinese_mythology.mcsave
new file mode 100644
index 0000000..83fe9ac
Binary files /dev/null and b/world_templates/26+/chinese_mythology.mcsave differ
diff --git a/world_templates/26+/egyptian_mythology.mcsave b/world_templates/26+/egyptian_mythology.mcsave
new file mode 100644
index 0000000..35fc9cd
Binary files /dev/null and b/world_templates/26+/egyptian_mythology.mcsave differ
diff --git a/world_templates/26+/fallout.mcsave b/world_templates/26+/fallout.mcsave
new file mode 100644
index 0000000..9e370ab
Binary files /dev/null and b/world_templates/26+/fallout.mcsave differ
diff --git a/world_templates/26+/festive.mcsave b/world_templates/26+/festive.mcsave
new file mode 100644
index 0000000..74e4ee6
Binary files /dev/null and b/world_templates/26+/festive.mcsave differ
diff --git a/world_templates/26+/greek_mythology.mcsave b/world_templates/26+/greek_mythology.mcsave
new file mode 100644
index 0000000..7892bc3
Binary files /dev/null and b/world_templates/26+/greek_mythology.mcsave differ
diff --git a/world_templates/26+/halloween.mcsave b/world_templates/26+/halloween.mcsave
new file mode 100644
index 0000000..ad9e176
Binary files /dev/null and b/world_templates/26+/halloween.mcsave differ
diff --git a/world_templates/26+/halo.mcsave b/world_templates/26+/halo.mcsave
new file mode 100644
index 0000000..ddb59ac
Binary files /dev/null and b/world_templates/26+/halo.mcsave differ
diff --git a/world_templates/26+/littlebigplanet.mcsave b/world_templates/26+/littlebigplanet.mcsave
new file mode 100644
index 0000000..a3c262c
Binary files /dev/null and b/world_templates/26+/littlebigplanet.mcsave differ
diff --git a/world_templates/26+/mass_effect.mcsave b/world_templates/26+/mass_effect.mcsave
new file mode 100644
index 0000000..2652c61
Binary files /dev/null and b/world_templates/26+/mass_effect.mcsave differ
diff --git a/world_templates/26+/norse_mythology.mcsave b/world_templates/26+/norse_mythology.mcsave
new file mode 100644
index 0000000..1f9bb7c
Binary files /dev/null and b/world_templates/26+/norse_mythology.mcsave differ
diff --git a/world_templates/26+/pirates_of_the_caribbean.mcsave b/world_templates/26+/pirates_of_the_caribbean.mcsave
new file mode 100644
index 0000000..bbe4cd9
Binary files /dev/null and b/world_templates/26+/pirates_of_the_caribbean.mcsave differ
diff --git a/world_templates/26+/skyrim.mcsave b/world_templates/26+/skyrim.mcsave
new file mode 100644
index 0000000..4ff5614
Binary files /dev/null and b/world_templates/26+/skyrim.mcsave differ
diff --git a/world_templates/26+/steven_universe.mcsave b/world_templates/26+/steven_universe.mcsave
new file mode 100644
index 0000000..dbd10be
Binary files /dev/null and b/world_templates/26+/steven_universe.mcsave differ
diff --git a/world_templates/26+/super_mario.mcsave b/world_templates/26+/super_mario.mcsave
new file mode 100644
index 0000000..d42a7d8
Binary files /dev/null and b/world_templates/26+/super_mario.mcsave differ
diff --git a/world_templates/26_1_2/super_mario.mcsave b/world_templates/26+/the_nightmare_before_christmas.mcsave
similarity index 59%
rename from world_templates/26_1_2/super_mario.mcsave
rename to world_templates/26+/the_nightmare_before_christmas.mcsave
index 9a9f85a..f5fe295 100644
Binary files a/world_templates/26_1_2/super_mario.mcsave and b/world_templates/26+/the_nightmare_before_christmas.mcsave differ
diff --git a/world_templates/26+/toy_story.mcsave b/world_templates/26+/toy_story.mcsave
new file mode 100644
index 0000000..c87c40d
Binary files /dev/null and b/world_templates/26+/toy_story.mcsave differ
diff --git a/world_templates/26_1_2/chinese_mythology.mcsave b/world_templates/26_1_2/chinese_mythology.mcsave
deleted file mode 100644
index a0094c1..0000000
Binary files a/world_templates/26_1_2/chinese_mythology.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/egyptian_mythology.mcsave b/world_templates/26_1_2/egyptian_mythology.mcsave
deleted file mode 100644
index d2e4b41..0000000
Binary files a/world_templates/26_1_2/egyptian_mythology.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/fallout.mcsave b/world_templates/26_1_2/fallout.mcsave
deleted file mode 100644
index d09f3db..0000000
Binary files a/world_templates/26_1_2/fallout.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/festive.mcsave b/world_templates/26_1_2/festive.mcsave
deleted file mode 100644
index faac58c..0000000
Binary files a/world_templates/26_1_2/festive.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/greek_mythology.mcsave b/world_templates/26_1_2/greek_mythology.mcsave
deleted file mode 100644
index 4bb1daa..0000000
Binary files a/world_templates/26_1_2/greek_mythology.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/halloween.mcsave b/world_templates/26_1_2/halloween.mcsave
deleted file mode 100644
index 9035be8..0000000
Binary files a/world_templates/26_1_2/halloween.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/mass_effect.mcsave b/world_templates/26_1_2/mass_effect.mcsave
deleted file mode 100644
index ee6a4c5..0000000
Binary files a/world_templates/26_1_2/mass_effect.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/norse_mythology.mcsave b/world_templates/26_1_2/norse_mythology.mcsave
deleted file mode 100644
index 5cc4323..0000000
Binary files a/world_templates/26_1_2/norse_mythology.mcsave and /dev/null differ
diff --git a/world_templates/26_1_2/pirates_of_the_caribbean.mcsave b/world_templates/26_1_2/pirates_of_the_caribbean.mcsave
deleted file mode 100644
index 30c8065..0000000
Binary files a/world_templates/26_1_2/pirates_of_the_caribbean.mcsave and /dev/null differ