diff --git a/README.md b/README.md
index 6fbed59..b1ec8ac 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,7 @@ You can rename `modorganizer-basic_games-xxx` to whatever you want (e.g., `basic
 | Mount & Blade II: Bannerlord — [GOG](https://www.gog.com/game/mount_blade_ii_bannerlord) / [STEAM](https://store.steampowered.com/app/261550/Mount__Blade_II_Bannerlord/) | [Holt59](https://github.com/holt59/) | [game_mountandblade2.py](games/game_mountandblade2.py) | <ul><li>mod data checker</li></ul> |
 | Need for Speed: High Stakes | [uwx](https://github.com/uwx) | [game_nfshs.py](games/game_nfshs.py) | |
 | No Man's Sky - [GOG](https://www.gog.com/game/no_mans_sky) / [Steam](https://store.steampowered.com/app/275850/No_Mans_Sky/)|[EzioTheDeadPoet](https://eziothedeadpoet.github.io/AboutMe/)|[game_nomanssky.py](games/game_nomanssky.py)| |
+| Resident Evil Requiem — [STEAM](https://store.steampowered.com/app/3764200/Resident_Evil_Requiem/) | jfcarroll | [game_residentevilrequiem.py](games/game_residentevilrequiem.py) | <ul><li>mod data checker</li></ul> |
 | Slay the Spire 2 — [STEAM](s.team/a/2868840) | [Azlle](https://github.com/Azlle) | [game_sts2.py](games/game_sts2.py) | <ul><li>mod data checker</li></ul> |
 | S.T.A.L.K.E.R. Anomaly — [MOD](https://www.stalker-anomaly.com/) | [Qudix](https://github.com/Qudix) | [game_stalkeranomaly.py](games/game_stalkeranomaly.py) | <ul><li>mod data checker</li></ul> |
 | Stardew Valley — [GOG](https://www.gog.com/game/stardew_valley) / [STEAM](https://store.steampowered.com/app/413150/Stardew_Valley/) | [Syer10](https://github.com/Syer10), [Holt59](https://github.com/holt59/) | [game_stardewvalley.py](games/game_stardewvalley.py) | <ul><li>mod data checker</li></ul> |
diff --git a/games/game_residentevilrequiem.py b/games/game_residentevilrequiem.py
new file mode 100644
index 0000000..dbb7db5
--- /dev/null
+++ b/games/game_residentevilrequiem.py
@@ -0,0 +1,310 @@
+import re
+from pathlib import Path
+from typing import Iterable
+
+from PyQt6.QtCore import QFileInfo
+
+import mobase
+
+from ..basic_features import BasicModDataChecker, GlobPatterns
+from ..basic_features.utils import is_directory
+from ..basic_game import BasicGame
+
+
+class ResidentEvilRequiemModDataChecker(BasicModDataChecker):
+    """Mod data checker for Resident Evil Requiem (RE Engine).
+
+    Mods are loaded at runtime by REFramework, which supports:
+
+    - loose files under `natives/` (LooseFileLoader),
+    - `.pak` mods placed in `pak_mods/` (IntegrityCheckBypass_LoadPakDirectory),
+    - Lua scripts and native plugins under `reframework/`.
+
+    Most mods on Nexus are packaged for Fluffy Mod Manager: the payload is
+    wrapped in one or more folders (usually the mod name) next to Fluffy
+    metadata (modinfo.ini, screenshots, readmes). Single-option archives are
+    unwrapped automatically. Multi-option archives are ambiguous, so they fall
+    through to the manual installer - but re-rooting to one option there gives
+    a layout that is valid without further fixing, because the manual
+    installer never applies `fix()`: Fluffy metadata is merely ignored, and
+    `.pak` files are valid at the mod root because the whole mod is cleaned
+    up on disk right after installation - see
+    `ResidentEvilRequiemGame._fix_installed_mod()`, which covers manual and
+    BAIN installs as well.
+    """
+
+    def __init__(self):
+        super().__init__(
+            GlobPatterns(
+                valid=[
+                    "natives",
+                    "reframework",
+                    "pak_mods",
+                    # Pak storage of installed mods:
+                    # ResidentEvilRequiemGame.mappings() maps its content
+                    # into pak_mods/ with a load-order prefix.
+                    "paks",
+                    "dinput8.dll",
+                    # Moved into paks/ after install, see
+                    # ResidentEvilRequiemGame._fix_installed_mod().
+                    "*.pak",
+                ],
+                # Fluffy Mod Manager metadata: inert, so keep it - this way
+                # manually (re-)rooted mods are valid without any fixing.
+                ignore=[
+                    "modinfo.ini",
+                    "screenshot.*",
+                    "*.txt",
+                    "*.md",
+                    "*.jpg",
+                    "*.jpeg",
+                    "*.png",
+                    "*.url",
+                ],
+                move={
+                    # The archive was created from inside the natives folder.
+                    "stm": "natives/",
+                },
+            )
+        )
+
+    def _wrapper_dir(self, filetree: mobase.IFileTree) -> mobase.IFileTree | None:
+        """Find the single directory the mod payload is wrapped in.
+
+        Fluffy mod archives usually wrap the payload in a folder named after
+        the mod. Returns the only directory of `filetree` that is neither
+        valid, movable nor ignorable, provided everything next to it is junk
+        (ignorable). Returns None otherwise (e.g. for multi-option Fluffy
+        packs with several wrapper candidates, which need a manual install).
+        """
+        rp = self._regex_patterns
+        wrapper: mobase.IFileTree | None = None
+        for entry in filetree:
+            name = entry.name().casefold()
+            if rp.ignore.match(name) or rp.delete.match(name):
+                continue
+            if rp.valid.match(name) or rp.move_match(name) is not None:
+                # Meaningful content next to a potential wrapper: the base
+                # checker already knows how to handle this level.
+                return None
+            if not is_directory(entry) or wrapper is not None:
+                return None
+            wrapper = entry
+        return wrapper
+
+    def dataLooksValid(
+        self, filetree: mobase.IFileTree
+    ) -> mobase.ModDataChecker.CheckReturn:
+        status = super().dataLooksValid(filetree)
+        if status is mobase.ModDataChecker.INVALID:
+            wrapper = self._wrapper_dir(filetree)
+            if wrapper is not None and (
+                self.dataLooksValid(wrapper) is not mobase.ModDataChecker.INVALID
+            ):
+                status = mobase.ModDataChecker.FIXABLE
+        return status
+
+    def fix(self, filetree: mobase.IFileTree) -> mobase.IFileTree:
+        # Unwrap (possibly nested) Fluffy mod folders first.
+        while (
+            super().dataLooksValid(filetree) is mobase.ModDataChecker.INVALID
+            and (wrapper := self._wrapper_dir(filetree)) is not None
+        ):
+            # Everything next to the wrapper is junk (see _wrapper_dir), and
+            # the wrapper level disappears, so drop the junk with it.
+            for entry in list(filetree):
+                if entry.name() != wrapper.name():
+                    entry.detach()
+            filetree.merge(wrapper)
+            wrapper.detach()
+        return super().fix(filetree)
+
+
+class ResidentEvilRequiemGame(
+    BasicGame, mobase.IPluginFileMapper, mobase.IPluginDiagnose
+):
+    def __init__(self):
+        BasicGame.__init__(self)
+        mobase.IPluginFileMapper.__init__(self)
+        mobase.IPluginDiagnose.__init__(self)
+
+    def init(self, organizer: mobase.IOrganizer) -> bool:
+        super().init(organizer)
+        self._register_feature(ResidentEvilRequiemModDataChecker())
+        organizer.modList().onModInstalled(self._fix_installed_mod)
+        return True
+
+    Name = "Resident Evil Requiem Support Plugin"
+    Author = "HomerSimpleton Returns Again"
+    Version = "1.0"
+
+    GameName = "Resident Evil Requiem"
+    GameShortName = "residentevilrequiem"
+    GameNexusName = "residentevilrequiem"
+    GameSteamId = 3764200
+
+    GameBinary = "re9.exe"
+    GameDataPath = "%GAME_PATH%"
+
+    # Where installed mods store their paks. The folder overlays into the
+    # game directory as an inert "paks" dir the game never reads - only the
+    # numbered virtual copies created by mappings() are loaded. (Hiding the
+    # folder with a .mohidden suffix breaks the explicit file mappings with
+    # usvfs 0.5.6, so the inert leak is deliberate.)
+    _PAK_STORAGE_DIR = "paks"
+
+    _PAK_NUMBER_PREFIX = re.compile(r"^\d{4} - ", re.ASCII)
+
+    # Fluffy Mod Manager metadata: only read by Fluffy itself, and colliding
+    # between mods, so not worth keeping in the installed mod.
+    _FLUFFY_METADATA_GLOBS = ("modinfo.ini", "screenshot.*")
+
+    @staticmethod
+    def _parse_modinfo(path: Path) -> dict[str, str]:
+        """Parse a Fluffy Mod Manager modinfo.ini (plain key=value lines,
+        no sections). Returns an empty dict if the file cannot be read."""
+        info: dict[str, str] = {}
+        try:
+            text = path.read_text(encoding="utf-8-sig", errors="replace")
+        except OSError:
+            return info
+        for line in text.splitlines():
+            key, sep, value = line.partition("=")
+            if sep and key.strip() and value.strip():
+                info.setdefault(key.strip().casefold(), value.strip())
+        return info
+
+    def _fix_installed_mod(self, mod: mobase.IModInterface) -> None:
+        """Clean up a freshly installed mod on disk: salvage MO2 metadata
+        from the Fluffy modinfo.ini, delete the Fluffy metadata files and
+        collect .pak files (mod root and shipped pak_mods/) into the mod's
+        pak storage folder, from where mappings() feeds them to
+        REFramework. Files are never renamed after installation.
+
+        The ModDataChecker cannot do this: neither the manual installer nor
+        the BAIN installer apply `fix()`, and multi-option Fluffy packs have
+        to go through one of those.
+        """
+        if self._organizer.managedGame() != self:
+            return
+        mod_path = Path(mod.absolutePath())
+        # Fill MO2's metadata from modinfo.ini before it is deleted - but
+        # never override what MO2 already knows (e.g. from a Nexus download).
+        modinfo_path = mod_path / "modinfo.ini"
+        if modinfo_path.is_file():
+            modinfo = self._parse_modinfo(modinfo_path)
+            version = modinfo.get("version")
+            if version and not mod.version().isValid():
+                mod.setVersion(mobase.VersionInfo(version))
+            url = modinfo.get("homepage") or modinfo.get("website")
+            if url and not mod.url():
+                mod.setUrl(url)
+        for pattern in self._FLUFFY_METADATA_GLOBS:
+            for junk in mod_path.glob(pattern):
+                if junk.is_file():
+                    junk.unlink()
+        # Collect the paks into the hidden storage folder.
+        shipped_pak_mods = mod_path / "pak_mods"
+        paks = [
+            p
+            for pak_dir in (mod_path, shipped_pak_mods)
+            for p in pak_dir.glob("*.pak")
+            if p.is_file()
+        ]
+        if paks:
+            storage = mod_path / self._PAK_STORAGE_DIR
+            storage.mkdir(exist_ok=True)
+            for pak in paks:
+                # Strip a leftover load-order prefix: load order is handled
+                # by mappings() now.
+                target = storage / self._PAK_NUMBER_PREFIX.sub("", pak.name)
+                if not target.exists():
+                    pak.rename(target)
+        if shipped_pak_mods.is_dir() and not any(shipped_pak_mods.iterdir()):
+            shipped_pak_mods.rmdir()
+
+    # IPluginFileMapper: REFramework loads every *.pak found in pak_mods/ in
+    # alphabetical order. The stored paks of all active mods are mapped into
+    # pak_mods/ with a global sequence number prefix, so that the load order
+    # follows MO2's mod order - the same scheme Fluffy Mod Manager uses with
+    # its own number prefixes. The mapping is virtual and rebuilt on every
+    # launch; nothing on disk changes. Within one mod, paks are ordered by
+    # their case-insensitive file name, so renaming the files in the mod's
+    # pak storage folder reorders them.
+
+    def _active_mod_paths(self) -> Iterable[Path]:
+        mods_parent_path = Path(self._organizer.modsPath())
+        modlist = self._organizer.modList()
+        for mod_name in modlist.allModsByProfilePriority():
+            if modlist.state(mod_name) & mobase.ModState.ACTIVE:
+                yield mods_parent_path / mod_name
+
+    def mappings(self) -> list[mobase.Mapping]:
+        pak_mods_dir = Path(self.gameDirectory().absolutePath()) / "pak_mods"
+        # Without a directory link on pak_mods/, the virtual pak files below
+        # are not enumerable - directory scans (like REFramework's) would
+        # not see them (compare game_finalfantasy7remake.py). Anchor that
+        # link with a dedicated, permanently empty plugin-data folder. No
+        # createTarget: writes into the virtual pak_mods/ should still land
+        # in overwrite via MO2's regular root mapping.
+        anchor = (
+            Path(self._organizer.pluginDataPath()) / "residentevilrequiem" / "pak_mods"
+        )
+        anchor.mkdir(parents=True, exist_ok=True)
+        mappings: list[mobase.Mapping] = [
+            mobase.Mapping(str(anchor), str(pak_mods_dir), True, False)
+        ]
+        number = 0
+        for mod_path in self._active_mod_paths():
+            storage = mod_path / self._PAK_STORAGE_DIR
+            if not storage.is_dir():
+                continue
+            for pak in sorted(
+                storage.glob("*.pak"), key=lambda pak: pak.name.casefold()
+            ):
+                if not pak.is_file():
+                    continue
+                number += 1
+                mappings.append(
+                    mobase.Mapping(
+                        str(pak),
+                        str(pak_mods_dir / f"{number:04d} - {pak.name}"),
+                        False,
+                    )
+                )
+        return mappings
+
+    def _reframework_installed(self) -> bool:
+        return QFileInfo(self.gameDirectory(), "dinput8.dll").exists()
+
+    # IPluginDiagnose: mods only load through REFramework, so warn when it
+    # is missing from the game directory.
+
+    def activeProblems(self) -> list[int]:
+        if self._organizer.managedGame() == self and not self._reframework_installed():
+            return [self._PROBLEM_NO_REFRAMEWORK]
+        return []
+
+    _PROBLEM_NO_REFRAMEWORK = 0
+
+    def shortDescription(self, key: int) -> str:
+        return "REFramework is not installed in the game directory."
+
+    def fullDescription(self, key: int) -> str:
+        return (
+            "REFramework provides the mod loaders this plugin relies on: loose files "
+            "from natives/, .pak mods from pak_mods/ and scripts from reframework/. "
+            "Without it, installed mods have no effect.\n\n"
+            "Download REFramework from "
+            "https://www.nexusmods.com/residentevilrequiem/mods/13 and extract it "
+            "(dinput8.dll) directly into the game directory:\n"
+            f"{self.gameDirectory().absolutePath()}\n\n"
+            "Install it directly into the game directory rather than as a mod, so "
+            "the loader DLL is always active regardless of the virtual file system."
+        )
+
+    def hasGuidedFix(self, key: int) -> bool:
+        return False
+
+    def startGuidedFix(self, key: int) -> None:
+        pass