diff --git a/modules/functionality/tmux-minecraft-server.nix b/modules/functionality/tmux-minecraft-server.nix
new file mode 100644
index 0000000..1c7d007
--- /dev/null
+++ b/modules/functionality/tmux-minecraft-server.nix
@@ -0,0 +1,201 @@
+# Derived from nixpkgs/nixos/modules/services/games/minecraft-server.nix
+{ config, lib, pkgs, ... }:
+with lib;
+with lib.hlissner;
+let
+  cfg = config.services.tmux-minecraft-server;
+
+  files = {
+    # We don't allow eula=false anyways
+    eula = builtins.toFile "eula.txt" ''
+      # eula.txt managed by NixOS Configuration
+      eula=true
+    '';
+
+    whitelist = pkgs.writeText "whitelist.json"
+      (builtins.toJSON
+        (mapAttrsToList (n: v: { name = n; uuid = v; }) cfg.whitelist));
+
+
+    serverProperties =
+      let
+        cfgToString = v: if builtins.isBool v then boolToString v else toString v;
+      in
+      pkgs.writeText "server.properties" (''
+        # server.properties managed by NixOS configuration
+      '' + concatStringsSep "\n" (mapAttrsToList
+        (n: v: "${n}=${cfgToString v}")
+        cfg.serverProperties));
+  };
+
+  ports = {
+    server = cfg.serverProperties.server-port or 25565;
+
+    rcon =
+      if cfg.serverProperties.enable-rcon or false
+      then cfg.serverProperties."rcon.port" or 25575
+      else null;
+
+    query =
+      if cfg.serverProperties.enable-query or false
+      then cfg.serverProperties."query.port" or 25565
+      else null;
+  };
+in
+{
+  options.services.minecraft-server = {
+
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        If enabled, start a Minecraft Server. The server
+        data will be loaded from and saved to
+        <option>services.minecraft-server.dataDir</option>.
+      '';
+    };
+
+    eula = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether you agree to
+        <link xlink:href="https://account.mojang.com/documents/minecraft_eula">
+        Mojangs EULA</link>. This option must be set to
+        <literal>true</literal> to run Minecraft server.
+      '';
+    };
+
+    dataDir = mkOption {
+      type = types.path;
+      default = "/var/lib/minecraft";
+      description = ''
+        Directory to store Minecraft database and other state/data files.
+      '';
+    };
+
+    openFirewall = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Whether to open ports in the firewall for the server.
+      '';
+    };
+
+    whitelist = mkOption {
+      type =
+        let
+          minecraftUUID = types.strMatching
+            "[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}" // {
+            description = "Minecraft UUID";
+          };
+        in
+        types.attrsOf minecraftUUID;
+      default = { };
+      description = ''
+        Whitelisted players, only has an effect when
+        <option>services.minecraft-server.declarative</option> is
+        <literal>true</literal> and the whitelist is enabled
+        via <option>services.minecraft-server.serverProperties</option> by
+        setting <literal>white-list</literal> to <literal>true</literal>.
+        This is a mapping from Minecraft usernames to UUIDs.
+        You can use <link xlink:href="https://mcuuid.net/"/> to get a
+        Minecraft UUID for a username.
+      '';
+      example = literalExpression ''
+        {
+          username1 = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
+          username2 = "yyyyyyyy-yyyy-yyyy-yyyy-yyyyyyyyyyyy";
+        };
+      '';
+    };
+
+    serverProperties = mkOption {
+      type = with types; attrsOf (oneOf [ bool int str ]);
+      default = { };
+      example = literalExpression ''
+        {
+          server-port = 43000;
+          difficulty = 3;
+          gamemode = 1;
+          max-players = 5;
+          motd = "NixOS Minecraft server!";
+          white-list = true;
+          enable-rcon = true;
+          "rcon.password" = "hunter2";
+        }
+      '';
+      description = ''
+        Minecraft server properties for the server.properties file. Only has
+        an effect when <option>services.minecraft-server.declarative</option>
+        is set to <literal>true</literal>. See
+        <link xlink:href="https://minecraft.gamepedia.com/Server.properties#Java_Edition_3"/>
+        for documentation on these values.
+      '';
+    };
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.minecraft-server;
+      defaultText = literalExpression "pkgs.minecraft-server";
+      example = literalExpression "pkgs.minecraft-server_1_12_2";
+      description = "Version of minecraft-server to run.";
+    };
+
+    jvmOpts = mkOption {
+      type = types.separatedString " ";
+      default = "-Xmx2048M -Xms2048M";
+      # Example options from https://minecraft.gamepedia.com/Tutorials/Server_startup_script
+      example = "-Xmx2048M -Xms4092M -XX:+UseG1GC -XX:+CMSIncrementalPacing "
+        + "-XX:+CMSClassUnloadingEnabled -XX:ParallelGCThreads=2 "
+        + "-XX:MinHeapFreeRatio=5 -XX:MaxHeapFreeRatio=10";
+      description = "JVM options for the Minecraft server.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    users.users.minecraft = {
+      description = "Minecraft server service user";
+      home = cfg.dataDir;
+      createHome = true;
+      isSystemUser = true;
+      group = "minecraft";
+    };
+    users.groups.minecraft = { };
+
+    systemd.services.minecraft-server = {
+      description = "Minecraft Server Service";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+
+      serviceConfig = {
+        ExecStart = "${cfg.package}/bin/minecraft-server ${cfg.jvmOpts}";
+        Restart = "always";
+        User = "minecraft";
+        WorkingDirectory = cfg.dataDir;
+      };
+
+      preStart = with files; ''
+        ln -sf ${eula} eula.txt
+        ln -sf ${whitelist} whitelist.json
+        cp -f ${serverProperties} server.properties
+      '');
+    };
+
+    networking.firewall = mkIf cfg.openFirewall (with ports; {
+      allowedUDPPorts = [ server ];
+      allowedTCPPorts = [ server ]
+        ++ optional (query != null) query
+        ++ optional (rcon != null) rcon;
+    });
+
+    assertions = [
+      {
+        assertion = cfg.eula;
+        message = "You must agree to Mojangs EULA to run minecraft-server."
+          + " Read https://account.mojang.com/documents/minecraft_eula and"
+          + " set `services.minecraft-server.eula` to `true` if you agree.";
+      }
+    ];
+  };
+}