diff --git a/games/game_subnautica-below-zero.py b/games/game_subnautica-below-zero.py
index e87e6c0..5b9e3a7 100644
--- a/games/game_subnautica-below-zero.py
+++ b/games/game_subnautica-below-zero.py
@@ -9,14 +9,14 @@ class SubnauticaBelowZeroGame(game_subnautica.SubnauticaGame):
 
     Name = "Subnautica Below Zero Support Plugin"
     Author = "dekart811, Zash"
-    Version = "2.0"
+    Version = "2.1"
 
     GameName = "Subnautica: Below Zero"
     GameShortName = "subnauticabelowzero"
     GameNexusName = "subnauticabelowzero"
     GameSteamId = 848450
     GameBinary = "SubnauticaZero.exe"
-    GameDataPath = ""
+    GameDataPath = "_ROOT"
     GameDocumentsDirectory = "%GAME_PATH%"
     GameSupportURL = (
         r"https://github.com/ModOrganizer2/modorganizer-basic_games/wiki/"
diff --git a/games/game_subnautica.py b/games/game_subnautica.py
index ad59300..33b75a7 100644
--- a/games/game_subnautica.py
+++ b/games/game_subnautica.py
@@ -1,9 +1,11 @@
 from __future__ import annotations
+from enum import Enum
 
 import os
+from collections.abc import Iterable
 from pathlib import Path
 
-from PyQt5.QtCore import QDir
+from PyQt5.QtCore import QDir, qWarning
 
 import mobase
 
@@ -30,11 +32,11 @@ class SubnauticaModDataChecker(BasicModDataChecker):
     }
 
 
-class SubnauticaGame(BasicGame):
+class SubnauticaGame(BasicGame, mobase.IPluginFileMapper):
 
     Name = "Subnautica Support Plugin"
     Author = "dekart811, Zash"
-    Version = "2.0"
+    Version = "2.1"
 
     GameName = "Subnautica"
     GameShortName = "subnautica"
@@ -42,8 +44,8 @@ class SubnauticaGame(BasicGame):
     GameSteamId = 264710
     GameEpicId = "Jaguar"
     GameBinary = "Subnautica.exe"
-    GameDataPath = ""
-    GameDocumentsDirectory = "%GAME_PATH%"
+    GameDataPath = "_ROOT"  # Custom mappings to actual root folders below.
+    GameDocumentsDirectory = r"%GAME_PATH%"
     GameSupportURL = (
         r"https://github.com/ModOrganizer2/modorganizer-basic_games/wiki/"
         "Game:-Subnautica"
@@ -57,6 +59,25 @@ class SubnauticaGame(BasicGame):
 
     _forced_libraries = ["winhttp.dll"]
 
+    _root_blacklist = {GameDataPath.casefold()}
+
+    class MapType(Enum):
+        FILE = 0
+        FOLDER = 1
+
+    _root_extra_overwrites: dict[str, MapType] = {
+        "qmodmanager_log-Subnautica.txt": MapType.FILE,
+        "qmodmanager-config.json": MapType.FILE,
+        "BepInEx_Shim_Backup": MapType.FOLDER,
+    }
+    """Extra files & folders created in game root by mods / BepInEx after game launch,
+    but not included in the mod archives.
+    """
+
+    def __init__(self):
+        super().__init__()
+        mobase.IPluginFileMapper.__init__(self)
+
     def init(self, organizer: mobase.IOrganizer) -> bool:
         super().init(organizer)
         self._featureMap[mobase.ModDataChecker] = SubnauticaModDataChecker()
@@ -80,3 +101,75 @@ class SubnauticaGame(BasicGame):
             mobase.ExecutableForcedLoadSetting(self.binaryName(), lib).withEnabled(True)
             for lib in self._forced_libraries
         ]
+
+    def mappings(self) -> list[mobase.Mapping]:
+        game = self._organizer.managedGame()
+        game_path = Path(game.gameDirectory().absolutePath())
+        overwrite_path = Path(self._organizer.overwritePath())
+
+        return [
+            *(
+                # Extra overwrites
+                self._overwrite_mapping(
+                    overwrite_path / name,
+                    dest,
+                    is_dir=(map_type is self.MapType.FOLDER),
+                )
+                for name, map_type in self._root_extra_overwrites.items()
+                if not (dest := game_path / name).exists()
+            ),
+            *self._root_mappings(game_path, overwrite_path),
+        ]
+
+    def _root_mappings(
+        self, game_path: Path, overwrite_path: Path
+    ) -> Iterable[mobase.Mapping]:
+        for mod_path in self._active_mod_paths():
+            mod_name = mod_path.name
+
+            for child in mod_path.iterdir():
+                # Check blacklist
+                if child.name.casefold() in self._root_blacklist:
+                    qWarning(f"Skipping {child.name} ({mod_name})")
+                    continue
+                destination = game_path / child.name
+                # Check existing
+                if destination.exists():
+                    qWarning(
+                        f"Overwriting of existing game files/folders is not supported! "
+                        f"{destination.as_posix()} ({mod_name})"
+                    )
+                    continue
+                # Mapping: mod -> root
+                yield mobase.Mapping(
+                    source=str(child),
+                    destination=str(destination),
+                    is_directory=child.is_dir(),
+                    create_target=False,
+                )
+                if child.is_dir():
+                    # Mapping: overwrite <-> root
+                    yield self._overwrite_mapping(
+                        overwrite_path / child.name, destination, is_dir=True
+                    )
+
+    def _active_mod_paths(self) -> Iterable[Path]:
+        mods_parent_path = Path(self._organizer.modsPath())
+        modlist = self._organizer.modList().allModsByProfilePriority()
+        for mod in modlist:
+            if self._organizer.modList().state(mod) & mobase.ModState.ACTIVE:
+                yield mods_parent_path / mod
+
+    def _overwrite_mapping(
+        self, overwrite_source: Path, destination: Path, is_dir: bool
+    ) -> mobase.Mapping:
+        """Mapping: overwrite <-> root"""
+        if is_dir:
+            # Root folders in overwrite need to exits.
+            overwrite_source.mkdir(parents=True, exist_ok=True)
+        return mobase.Mapping(
+            str(overwrite_source),
+            str(destination),
+            is_dir,
+            create_target=True,
+        )