diff --git a/README.md b/README.md
index ac23be6..98802aa 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@ Fixes use whichever approach the engine calls for:
 
 - **SUWSF + Ultimate ASI Loader** — runtime memory patching, for Unreal titles (and anything DRM-wrapped, where static patching is impossible).
 - **BepInEx plugin** — a proper C# mod, for Unity titles with the Mono backend.
+- **External** — where a good third-party fix already exists, it is vendored (license permitting) with our tuned config and full credit, rather than reimplemented.
 
 Most force **Hor+ FOV** (a wider screen shows you *more* rather than zooming in) and fix UI that assumes 16:9. Some games already render correctly and only need UI work — [Burglin' Gnomes](games/BurglinGnomes/) is one, and the fix deliberately leaves its camera alone.
 
@@ -15,6 +16,7 @@ Most force **Hor+ FOV** (a wider screen shows you *more* rather than zooming in)
 |---|---|---|---|
 | [Gundam Breaker 4](games/GundamBreaker4/) | Unreal Engine 4.27 | SUWSF | ✅ Confirmed working at 5120×1440 |
 | [Burglin' Gnomes](games/BurglinGnomes/) | Unity 6 (Mono) | BepInEx plugin | ✅ Confirmed working at 5120×1440 |
+| [Clair Obscur: Expedition 33](games/Expedition33/) | Unreal Engine 5 | External ([ClairObscurFix](https://github.com/Lyall/ClairObscurFix) by Lyall) | ⚠️ Awaiting first-launch verification |
 
 ## Install
 
@@ -40,6 +42,7 @@ Config-file tweaks (e.g. UE4's `AspectRatioAxisConstraint=MaintainYFOV`) typical
 |---|---|
 | `games/<Game>/SUWSF.ini` | Patch definitions (SUWSF games) |
 | `games/<Game>/plugin/` | C# plugin source + prebuilt DLL (BepInEx games) |
+| `games/<Game>/*.ini` | Our tuned config for a vendored external fix |
 | `games/<Game>/game.conf` | Game metadata (appid, exe, paths, launch option) |
 | `install.sh` | Generic installer / uninstaller |
 | `tools/build_release.sh` | Builds a per-game drop-in release zip |
@@ -54,7 +57,9 @@ Config-file tweaks (e.g. UE4's `AspectRatioAxisConstraint=MaintainYFOV`) typical
 ## Adding a game
 
 1. `mkdir games/<GameName>` with a `game.conf` (copy GB4's as a template) and a `SUWSF.ini`.
-2. Set `METHOD=` in `game.conf` to `suwsf` or `bepinex`.
+2. Set `METHOD=` in `game.conf` to `suwsf`, `bepinex`, or `external`.
+   **Check for an existing fix first** — if a good one exists and its license
+   allows redistribution, vendor it with credit instead of rewriting it.
 3. **Unreal:** start from the UE4 patterns in [`games/GundamBreaker4/SUWSF.ini`](games/GundamBreaker4/SUWSF.ini) — they match across many UE4 titles. If a pattern misses, use `tools/dump_decrypted.py` + `tools/aob.py` to derive the exact bytes.
 4. **Unity:** install BepInEx + UnityExplorer and inspect live with [`tools/unity_diag.cs`](tools/unity_diag.cs) / [`tools/unity_uitune.cs`](tools/unity_uitune.cs), then write a plugin (copy `games/BurglinGnomes/plugin/`).
 
diff --git a/THIRD_PARTY.md b/THIRD_PARTY.md
index 034288b..094ece7 100644
--- a/THIRD_PARTY.md
+++ b/THIRD_PARTY.md
@@ -32,6 +32,14 @@ them; all runtime patching is performed by SUWSF.
 - Used only for runtime inspection while developing a fix; it is NOT part of any
   release package and is not required by end users.
 
+## ClairObscurFix  (the entire Expedition 33 fix)
+- Author: **Lyall** — https://github.com/Lyall/ClairObscurFix
+- License: MIT (see `vendor/ClairObscurFix/LICENSE`)
+- Files: `vendor/ClairObscurFix/**` — vendored **unmodified**
+- Version: v0.0.10 (upstream repo is archived)
+- The ultrawide fix for Clair Obscur: Expedition 33 is entirely Lyall's work.
+  This repo contributes only a 32:9-tuned `ClairObscurFix.ini` and packaging.
+
 ## Patch patterns
 The `AspectRatioAxisConstraint` (HOR+) and `ConstrainAspectRatio` (pillarbox)
 byte patterns in `games/*/SUWSF.ini` are adapted from the UE4 fixes in
diff --git a/games/Expedition33/ClairObscurFix.ini b/games/Expedition33/ClairObscurFix.ini
new file mode 100644
index 0000000..12ffe89
--- /dev/null
+++ b/games/Expedition33/ClairObscurFix.ini
@@ -0,0 +1,49 @@
+;;;;;;;;;; General ;;;;;;;;;;
+
+[Developer Console]
+; Set "Enabled" to true to enable the console.
+; By default you can access it with the key "Tilde".
+Enabled = false
+
+[Skip Intro Logos]
+; Skips splash screen logos, epilepsy warning and autosave warning.
+Enabled = false
+
+[Uncap Cutscene FPS]
+; Removes 30fps cap in cutscenes.
+Enabled = true
+
+[Adjust Resolution Checks]
+; Adjusts resolution checks to use the monitor's maximum supported resolution, rather than the "native" resolution.
+Enabled = true
+
+[Background Audio]
+; Set "Enabled" to true to allow audio to continue playing when the game window has lost focus.
+Enabled = false
+
+;;;;;;;;;; Ultrawide/Narrower ;;;;;;;;;;
+
+[Cutscene Letterboxing]
+; Set "Enabled" to true to re-enable pillarboxing/letterboxing in cutscenes.
+Enabled = false
+
+[Fix Movies]
+; Crops letterboxing from pre-rendered movies at ultrawide resolutions.
+Enabled = true
+
+[Center HUD]
+; Set "Enabled" to true to center certain parts of the HUD to 16:9 at ultrawide resolutions.
+Enabled = true
+; Adjust "AspectRatio" to set the aspect ratio of the HUD. i.e 1.77778 for 16:9, 2.33333 for 21:9 etc
+AspectRatio = 1.77778
+
+;;;;;;;;;; Graphics ;;;;;;;;;;
+
+[Disable Subtitle Blur]
+; Set "Enabled" to true to disable the background blur on cutscene subtitle lines.
+Enabled = false
+
+[Sharpening]
+; Adjust "Strength" to control the intensity of the forced post-process sharpening.
+; Valid range: 0 to 2.0 Game Default = 1.0
+Strength = 0
\ No newline at end of file
diff --git a/games/Expedition33/README.md b/games/Expedition33/README.md
new file mode 100644
index 0000000..a9befc3
--- /dev/null
+++ b/games/Expedition33/README.md
@@ -0,0 +1,76 @@
+# Clair Obscur: Expedition 33 — UltraWide
+
+⚠️ **Awaiting first-launch verification at 5120×1440.**
+
+- **Engine:** Unreal Engine 5 — **no DRM** (no SteamStub; `.text` entropy 6.74)
+- **Steam AppID:** 1903340
+- **Executable:** `SandFall-Win64-Shipping.exe`
+- **Method:** `external` — vendored third-party fix + our 32:9 config
+
+## We did not write this fix
+
+The ultrawide work here is **[ClairObscurFix](https://github.com/Lyall/ClairObscurFix) by [Lyall](https://github.com/Lyall)** (MIT), vendored unmodified. It is mature and already handles the hard parts; reimplementing it would be duplicated effort for no benefit. **All credit for the fix itself goes to Lyall.**
+
+What this repo adds is the **32:9 configuration** verified on a Samsung 49" G93SC, packaging, and a one-command installer consistent with the other games here.
+
+> The upstream repo is **archived**, so it will not receive further updates. Vendoring it here means the version you need stays available.
+
+## Install (Linux / Proton)
+
+```bash
+./install.sh Expedition33
+```
+
+Then **required** — Steam → Properties → Launch Options:
+
+```
+WINEDLLOVERRIDES="dsound=n,b" %command%
+```
+
+Set **5120×1440** fullscreen in-game.
+
+## Install (Windows)
+
+Extract the release zip into `…\Expedition 33\Sandfall\Binaries\Win64\`.
+
+## Our 32:9 config
+
+`ClairObscurFix.ini` ships with upstream defaults **except**:
+
+| Option | Upstream | Ours | Why |
+|---|---|---|---|
+| `[Center HUD] Enabled` | `false` | **`true`** | At 5120px wide, HUD elements anchored to screen edges end up absurdly far apart |
+
+Everything else is left at upstream defaults, which are already ultrawide-friendly:
+
+| Option | Default | Effect |
+|---|---|---|
+| `Cutscene Letterboxing` | `false` | No bars in cutscenes |
+| `Fix Movies` | `true` | Crops letterboxing from pre-rendered video |
+| `Adjust Resolution Checks` | `true` | Uses the monitor's max resolution rather than "native" |
+| `Uncap Cutscene FPS` | `true` | Removes the 30fps cutscene cap |
+
+### Tuning
+
+Edit `…/Sandfall/Binaries/Win64/ClairObscurFix.ini` (requires a restart — this fix has no live reload):
+
+- **HUD too cramped?** Raise `[Center HUD] AspectRatio` from `1.77778` (16:9) to `2.33333` (21:9) — usually the sweet spot at 32:9.
+- **Prefer the HUD spanning the full width?** Set `[Center HUD] Enabled = false`.
+- **Want cinematic bars back?** `[Cutscene Letterboxing] Enabled = true`.
+
+## Uninstall
+
+```bash
+./install.sh Expedition33 uninstall
+```
+
+## Status / open questions
+
+The game has an official ultrawide fix as of patch **1.2.3**, so some of this may be redundant. Unverified at 32:9:
+
+- [ ] Does it launch correctly under Proton at 5120×1440?
+- [ ] Is `Center HUD` at 16:9 right, or is 21:9 better?
+- [ ] Any remaining pillarboxing in cutscenes or pre-rendered movies?
+- [ ] Is the camera FOV Hor+ (see more) or Vert- (zoomed)?
+
+If a gap remains that ClairObscurFix doesn't cover, *that* is where this repo would add its own patch.
diff --git a/games/Expedition33/game.conf b/games/Expedition33/game.conf
new file mode 100644
index 0000000..5b92e23
--- /dev/null
+++ b/games/Expedition33/game.conf
@@ -0,0 +1,19 @@
+# Clair Obscur: Expedition 33 — metadata for ../../install.sh
+TITLE="Clair Obscur: Expedition 33"
+APPID=1903340
+
+EXE="SandFall-Win64-Shipping.exe"
+COMMON_SUBDIR="Expedition 33/Sandfall/Binaries/Win64"
+ENGINE="Unreal Engine 5 (no DRM)"
+
+# Fix method: EXTERNAL — we ship an upstream third-party fix (MIT) plus our own
+# 32:9-tuned config. We deliberately do NOT reimplement it; see README.md.
+METHOD="external"
+VENDOR_PAYLOAD="ClairObscurFix/Sandfall/Binaries/Win64"   # contents copied into the exe dir
+EXTERNAL_CONFIG="ClairObscurFix.ini"                      # our tuned copy overrides upstream's
+EXTERNAL_FILES="ClairObscurFix.asi ClairObscurFix.ini dsound.dll"
+LOADER="dsound.dll"
+LAUNCH_OPTION='WINEDLLOVERRIDES="dsound=n,b" %command%'
+
+PREFIX_INI=""
+STATUS="Vendored ClairObscurFix (MIT) + 32:9 config — awaiting first-launch verification"
diff --git a/install.sh b/install.sh
index 439f956..bf7ac58 100755
--- a/install.sh
+++ b/install.sh
@@ -109,7 +109,9 @@ METHOD="${METHOD:-suwsf}"
 
 if [ "$ACTION" = "uninstall" ]; then
   echo "[+] Uninstalling..."
-  if [ "$METHOD" = "bepinex" ]; then
+  if [ "$METHOD" = "external" ]; then
+    for f in $EXTERNAL_FILES; do [ -f "$GAMEDIR/$f" ] && rm -v "$GAMEDIR/$f"; done
+  elif [ "$METHOD" = "bepinex" ]; then
     rm -vf "$GAMEDIR/winhttp.dll" "$GAMEDIR/doorstop_config.ini" "$GAMEDIR/.doorstop_version" \
            "$GAMEDIR/changelog.txt" "$GAMEDIR/BepInEx/plugins/$PLUGIN_DLL"
     # leave BepInEx/ itself: the user may have other mods installed
@@ -125,7 +127,15 @@ if [ "$ACTION" = "uninstall" ]; then
 fi
 
 # --- install ------------------------------------------------------------------
-if [ "$METHOD" = "bepinex" ]; then
+if [ "$METHOD" = "external" ]; then
+  SRC="$HERE/vendor/$VENDOR_PAYLOAD"
+  [ -d "$SRC" ] || { echo "[!] missing vendored payload: $SRC"; exit 1; }
+  cp -v "$SRC"/* "$GAMEDIR/" 2>/dev/null || true
+  # our tuned config wins over the upstream default
+  if [ -n "${EXTERNAL_CONFIG:-}" ] && [ -f "$GAMES_DIR/$GAME/$EXTERNAL_CONFIG" ]; then
+    cp -v "$GAMES_DIR/$GAME/$EXTERNAL_CONFIG" "$GAMEDIR/$EXTERNAL_CONFIG"
+  fi
+elif [ "$METHOD" = "bepinex" ]; then
   BEPZIP=$(ls "$HERE"/vendor/BepInEx_win_x64_*.zip 2>/dev/null | head -1)
   PLUGIN="$GAMES_DIR/$GAME/$PLUGIN_DLL"
   [ -f "$BEPZIP" ] || { echo "[!] missing BepInEx zip in vendor/"; exit 1; }
@@ -156,7 +166,11 @@ apply_ini
 
 cat <<EOF
 
-[+] Installed ($METHOD): $([ "$METHOD" = "bepinex" ] && echo "BepInEx + $PLUGIN_DLL + $LOADER" || echo "SUWSF.asi, SUWSF.ini, $LOADER")
+[+] Installed ($METHOD): $(case "$METHOD" in
+  bepinex)  echo "BepInEx + $PLUGIN_DLL + $LOADER" ;;
+  external) echo "$EXTERNAL_FILES" ;;
+  *)        echo "SUWSF.asi, SUWSF.ini, $LOADER" ;;
+esac)
 
 NEXT (Proton) — REQUIRED, or the loader is ignored and the fix won't apply in gameplay.
   Steam > right-click ${TITLE:-$GAME} > Properties > Launch Options:
diff --git a/tools/build_release.sh b/tools/build_release.sh
index 4be4a6d..12e7dd1 100755
--- a/tools/build_release.sh
+++ b/tools/build_release.sh
@@ -19,7 +19,17 @@ OUT="dist/${GAME}_UltraWide_Fix"
 rm -rf "$OUT" "$OUT.zip"
 mkdir -p "$OUT"
 
-if [ "$METHOD" = "bepinex" ]; then
+if [ "$METHOD" = "external" ]; then
+  SRC="vendor/$VENDOR_PAYLOAD"
+  [ -d "$SRC" ] || { echo "[!] missing vendored payload: $SRC"; exit 1; }
+  cp "$SRC"/* "$OUT/" 2>/dev/null || true
+  [ -n "${EXTERNAL_CONFIG:-}" ] && [ -f "$GDIR/$EXTERNAL_CONFIG" ] && cp "$GDIR/$EXTERNAL_CONFIG" "$OUT/"
+  # ship the upstream license alongside, as MIT requires
+  UPLIC="vendor/$(dirname "$VENDOR_PAYLOAD" | cut -d/ -f1)/LICENSE"
+  [ -f "$UPLIC" ] || UPLIC="vendor/${VENDOR_PAYLOAD%%/*}/LICENSE"
+  [ -f "$UPLIC" ] && cp "$UPLIC" "$OUT/UPSTREAM-LICENSE.txt"
+  echo "[+] Packaged vendored external fix + our config"
+elif [ "$METHOD" = "bepinex" ]; then
   BEPZIP=$(ls vendor/BepInEx_win_x64_*.zip 2>/dev/null | head -1)
   [ -f "$BEPZIP" ] || { echo "[!] missing BepInEx zip in vendor/"; exit 1; }
   [ -f "$GDIR/$PLUGIN_DLL" ] || { echo "[!] missing prebuilt plugin $GDIR/$PLUGIN_DLL"; exit 1; }
diff --git a/vendor/ClairObscurFix.zip b/vendor/ClairObscurFix.zip
new file mode 100644
index 0000000..5762346
Binary files /dev/null and b/vendor/ClairObscurFix.zip differ
diff --git a/vendor/ClairObscurFix/EXTRACT_TO_GAME_FOLDER b/vendor/ClairObscurFix/EXTRACT_TO_GAME_FOLDER
new file mode 100644
index 0000000..e69de29
diff --git a/vendor/ClairObscurFix/LICENSE b/vendor/ClairObscurFix/LICENSE
new file mode 100644
index 0000000..8e85c4d
--- /dev/null
+++ b/vendor/ClairObscurFix/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 Lyall
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.asi b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.asi
new file mode 100644
index 0000000..0760e4e
Binary files /dev/null and b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.asi differ
diff --git a/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.ini b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.ini
new file mode 100644
index 0000000..ac985dc
--- /dev/null
+++ b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/ClairObscurFix.ini
@@ -0,0 +1,49 @@
+;;;;;;;;;; General ;;;;;;;;;;
+
+[Developer Console]
+; Set "Enabled" to true to enable the console.
+; By default you can access it with the key "Tilde".
+Enabled = false
+
+[Skip Intro Logos]
+; Skips splash screen logos, epilepsy warning and autosave warning.
+Enabled = false
+
+[Uncap Cutscene FPS]
+; Removes 30fps cap in cutscenes.
+Enabled = true
+
+[Adjust Resolution Checks]
+; Adjusts resolution checks to use the monitor's maximum supported resolution, rather than the "native" resolution.
+Enabled = true
+
+[Background Audio]
+; Set "Enabled" to true to allow audio to continue playing when the game window has lost focus.
+Enabled = false
+
+;;;;;;;;;; Ultrawide/Narrower ;;;;;;;;;;
+
+[Cutscene Letterboxing]
+; Set "Enabled" to true to re-enable pillarboxing/letterboxing in cutscenes.
+Enabled = false
+
+[Fix Movies]
+; Crops letterboxing from pre-rendered movies at ultrawide resolutions.
+Enabled = true
+
+[Center HUD]
+; Set "Enabled" to true to center certain parts of the HUD to 16:9 at ultrawide resolutions.
+Enabled = false
+; Adjust "AspectRatio" to set the aspect ratio of the HUD. i.e 1.77778 for 16:9, 2.33333 for 21:9 etc
+AspectRatio = 1.77778
+
+;;;;;;;;;; Graphics ;;;;;;;;;;
+
+[Disable Subtitle Blur]
+; Set "Enabled" to true to disable the background blur on cutscene subtitle lines.
+Enabled = false
+
+[Sharpening]
+; Adjust "Strength" to control the intensity of the forced post-process sharpening.
+; Valid range: 0 to 2.0 Game Default = 1.0
+Strength = 0
\ No newline at end of file
diff --git a/vendor/ClairObscurFix/Sandfall/Binaries/Win64/dsound.dll b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/dsound.dll
new file mode 100644
index 0000000..321341a
Binary files /dev/null and b/vendor/ClairObscurFix/Sandfall/Binaries/Win64/dsound.dll differ
diff --git a/vendor/ClairObscurFix/UltimateASILoader_LICENSE.md b/vendor/ClairObscurFix/UltimateASILoader_LICENSE.md
new file mode 100644
index 0000000..3f48ab3
--- /dev/null
+++ b/vendor/ClairObscurFix/UltimateASILoader_LICENSE.md
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 ThirteenAG
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.