diff --git a/pkgs/by-name/si/simple64/add-official-server-error-message.patch b/pkgs/by-name/si/simple64/add-official-server-error-message.patch
new file mode 100644
index 000000000000..7d37e33c11d1
--- /dev/null
+++ b/pkgs/by-name/si/simple64/add-official-server-error-message.patch
@@ -0,0 +1,15 @@
+diff --git a/simple64-gui/netplay/joinroom.cpp b/simple64-gui/netplay/joinroom.cpp
+index 3b5c34e..68b46f2 100644
+--- a/simple64-gui/netplay/joinroom.cpp
++++ b/simple64-gui/netplay/joinroom.cpp
+@@ -308,7 +308,9 @@ void JoinRoom::processTextMessage(QString message)
+         }
+         else
+         {
+-            msgBox.setText(json.value("message").toString());
++            QString msg = json.value("message").toString();
++            if(msg == "Bad authentication code") msg += "<br>Note: using the official netplay servers is not allowed on unofficial builds.<br>You can host your own server with `simple64-netplay-server`";
++            msgBox.setText(msg);
+             msgBox.exec();
+         }
+     }
diff --git a/pkgs/by-name/si/simple64/dont-use-vosk-and-discord.patch b/pkgs/by-name/si/simple64/dont-use-vosk-and-discord.patch
new file mode 100644
index 000000000000..69d595cc428a
--- /dev/null
+++ b/pkgs/by-name/si/simple64/dont-use-vosk-and-discord.patch
@@ -0,0 +1,37 @@
+diff --git a/build.sh b/build.sh
+index 254a90d..e2d26cf 100644
+--- a/build.sh
++++ b/build.sh
+@@ -77,7 +77,7 @@ cmake -G Ninja -DCMAKE_BUILD_TYPE="${RELEASE_TYPE}" ..
+ cmake --build .
+ cp simple64-video-parallel.* "${install_dir}"
+ 
+-if [[ ! -d "${base_dir}/discord" ]]; then
++if false; then
+   echo "Downloading Discord SDK"
+   mkdir -p "${base_dir}/discord"
+   cd "${base_dir}/discord"
+@@ -86,7 +86,7 @@ if [[ ! -d "${base_dir}/discord" ]]; then
+   rm discord_game_sdk.zip
+ fi
+ 
+-if [[ ! -d "${base_dir}/vosk" ]]; then
++if false; then
+   mkdir -p "${base_dir}/vosk"
+   cd "${base_dir}/vosk"
+   if [[ ${UNAME} == *"MINGW64"* ]]; then
+@@ -156,14 +156,6 @@ if [[ ${UNAME} == *"MINGW64"* ]]; then
+   cp -v "${base_dir}/7z/x64/7za.exe" "${install_dir}"
+   cp -v "${base_dir}/discord/lib/x86_64/discord_game_sdk.dll" "${install_dir}"
+   cp -v "${base_dir}/vosk/libvosk.dll" "${install_dir}/vosk.dll"
+-else
+-  cp "${base_dir}/vosk/libvosk.so" "${install_dir}"
+-  if [[ "${PLATFORM}" == "aarch64" ]]; then
+-    my_os=linux_aarch64
+-  else
+-    my_os=linux_x86_64
+-    cp "${base_dir}/discord/lib/x86_64/discord_game_sdk.so" "${install_dir}/libdiscord_game_sdk.so"
+-  fi
+ fi
+ 
+ if [[ "$1" == "zip" ]]; then
diff --git a/pkgs/by-name/si/simple64/package.nix b/pkgs/by-name/si/simple64/package.nix
new file mode 100644
index 000000000000..b55c75414161
--- /dev/null
+++ b/pkgs/by-name/si/simple64/package.nix
@@ -0,0 +1,101 @@
+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  fetchurl,
+  writeShellScriptBin,
+  cmake,
+  ninja,
+  pkg-config,
+  makeWrapper,
+  zlib,
+  libpng,
+  SDL2,
+  SDL2_net,
+  hidapi,
+  qt6,
+  vulkan-loader,
+}:
+
+let
+  cheats-json = fetchurl {
+    url = "https://raw.githubusercontent.com/simple64/cheat-parser/87963b7aca06e0d4632b66bc5ffe7d6b34060f4f/cheats.json";
+    hash = "sha256-rS/4Mdi+18C2ywtM5nW2XaJkC1YnKZPc4YdQ3mCfESU=";
+  };
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = "simple64";
+  version = "2024.09.1";
+
+  src = fetchFromGitHub {
+    owner = "simple64";
+    repo = "simple64";
+    rev = "refs/tags/v${finalAttrs.version}";
+    hash = "sha256-t3V7mvHlCP8cOvizR3N9DiCofnSvSHI6U0iXXkaMb34=";
+  };
+
+  patches = [
+    ./dont-use-vosk-and-discord.patch
+    ./add-official-server-error-message.patch
+  ];
+
+  postPatch = ''
+    cp ${cheats-json} cheats.json
+  '';
+
+  stictDeps = true;
+
+  nativeBuildInputs = [
+    qt6.wrapQtAppsHook
+    cmake
+    ninja
+    pkg-config
+    makeWrapper
+    # fake git command for version info generator
+    (writeShellScriptBin "git" "echo ${finalAttrs.src.rev}")
+  ];
+
+  buildInputs = [
+    zlib
+    libpng
+    SDL2
+    SDL2_net
+    hidapi
+    qt6.qtbase
+    qt6.qtwebsockets
+  ];
+
+  dontUseCmakeConfigure = true;
+
+  dontWrapQtApps = true;
+
+  buildPhase = ''
+    runHook preInstall
+
+    sh build.sh
+
+    runHook postInstall
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/share/simple64 $out/bin
+    cp -r simple64/* $out/share/simple64
+
+    makeWrapper $out/share/simple64/simple64-gui $out/bin/simple64-gui \
+        --prefix LD_LIBRARY_PATH : ${lib.makeLibraryPath [ vulkan-loader ]} \
+        "''${qtWrapperArgs[@]}"
+
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Easy to use N64 emulator";
+    homepage = "https://simple64.github.io";
+    license = lib.licenses.gpl3Only;
+    mainProgram = "simple64-gui";
+    maintainers = with lib.maintainers; [ tomasajt ];
+    platforms = lib.platforms.linux;
+  };
+})