diff --git a/engines/relentless-frontier/LICENSE b/engines/relentless-frontier/LICENSE
new file mode 100644
index 000000000..77167d906
--- /dev/null
+++ b/engines/relentless-frontier/LICENSE
@@ -0,0 +1,17 @@
+Copyright (c) 2019 Patryk Obara
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution. 
diff --git a/engines/relentless-frontier/assets/run-gzdoom.sh b/engines/relentless-frontier/assets/run-gzdoom.sh
new file mode 100755
index 000000000..c9b0a286e
--- /dev/null
+++ b/engines/relentless-frontier/assets/run-gzdoom.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+export SteamDeck=""
+unset SteamDeck
+
+LD_LIBRARY_PATH="lib:$LD_LIBRARY_PATH" ./rfgzdoom "$@"
diff --git a/engines/relentless-frontier/build.sh b/engines/relentless-frontier/build.sh
new file mode 100755
index 000000000..4c51df7ab
--- /dev/null
+++ b/engines/relentless-frontier/build.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# From https://gitlab.com/luxtorpeda/packages/gzdoom - See LICENSE file for more information
+# CLONE PHASE
+git clone https://github.com/Waffle-Iron-Studios/Griddle.git source
+pushd source
+git checkout "$COMMIT_HASH"
+popd
+
+# BUILD PHASE
+pushd "source"
+mkdir -p build
+cd build
+cmake \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_PREFIX_PATH="$pfx" \
+    ..
+make -j "$(nproc)"
+popd
+
+# COPY PHASE
+cp -rfv "source/build"/{rfgzdoom,soundfonts,*.pk3} "$diststart/common/dist/"
+cp -rfv assets/* "$diststart/common/dist/"
+
+ln -rsf "$diststart/common/dist/lib/libfluidsynth.so.3" "$diststart/common/dist/lib/libfluidsynth.so.2"
diff --git a/engines/relentless-frontier/env.json b/engines/relentless-frontier/env.json
new file mode 100644
index 000000000..026803619
--- /dev/null
+++ b/engines/relentless-frontier/env.json
@@ -0,0 +1,17 @@
+{
+    "STEAM_APP_ID_LIST": [
+        "1677900"
+    ],
+    "LICENSE_PATH": "./source/LICENSE",
+    "ADDITIONAL_LICENSES": [
+        "./LICENSE"
+    ],
+    "COMMON_PACKAGE": true,
+    "LIBRARIES": [
+        "zmusic"
+    ],
+    "APT_LIBRARIES": [
+        "mercurial"
+    ],
+    "COMMIT_HASH": "7b52b6c"
+}
diff --git a/engines/relentless-frontier/vcpkg.json b/engines/relentless-frontier/vcpkg.json
new file mode 100644
index 000000000..73b1e6ca7
--- /dev/null
+++ b/engines/relentless-frontier/vcpkg.json
@@ -0,0 +1,7 @@
+{
+    "$schema": "https://raw.githubusercontent.com/microsoft/vcpkg-tool/main/docs/vcpkg.schema.json",
+    "dependencies": [
+        { "name": "fluidsynth", "features": ["pulseaudio"] },
+        "libwebp"
+    ]
+}
diff --git a/metadata/packagessniper_v2.json b/metadata/packagessniper_v2.json
index 1d87859cb..e074652bb 100644
--- a/metadata/packagessniper_v2.json
+++ b/metadata/packagessniper_v2.json
@@ -9052,6 +9052,32 @@
             "cloudAvailable": true,
             "cloudSupported": true,
             "app_id": "1678420"
+        },
+        {
+            "game_name": "Relentless Frontier",
+            "download": [],
+            "command": "./run-gzdoom-local.sh",
+            "command_args": [
+                "-iwad",
+                "Content/RF.ipk3",
+                "-file",
+                "Content/griddle_rf.pk3",
+                "-file",
+                "Content/PK3/RF_Data.pk3",
+                "-config",
+                "gzdoom.ini",
+                "-savedir",
+                "./Content/Save"
+            ],
+            "notices": [
+                {
+                    "key": "saves",
+                    "value": "save_game_dir"
+                }
+            ],
+            "engine_name": "RFGZDoom",
+            "cloudNotAvailable": true,
+            "app_id": "1677900"
         }
     ],
     "engines": [
@@ -9148,6 +9174,17 @@
             ],
             "internal_engine_name": "gzdoom"
         },
+        {
+            "engine_link": "https://github.com/Waffle-Iron-Studios/Griddle/tree/rf-version",
+            "version": "7b52b6c",
+            "author": "dreamer/d10sfan",
+            "author_link": "https://github.com/dreamer",
+            "license": "GPLv3",
+            "license_link": "https://github.com/Waffle-Iron-Studios/Griddle/blob/rf-version/LICENSE",
+            "controllerSupported": true,
+            "engine_name": "RFGZDoom",
+            "internal_engine_name": "rfgzdoom"
+        },
         {
             "engine_link": "https://github.com/Youda008/DoomRunner",
             "version": "1.8.2",
@@ -11206,4 +11243,4 @@
             "value": "Save Format Not Compatible"
         }
     ]
-}
\ No newline at end of file
+}