diff --git a/freeciv-web/src/main/webapp/javascript/civclient.js b/freeciv-web/src/main/webapp/javascript/civclient.js
index 5b0403d8f..61e0b933f 100644
--- a/freeciv-web/src/main/webapp/javascript/civclient.js
+++ b/freeciv-web/src/main/webapp/javascript/civclient.js
@@ -226,6 +226,37 @@ function init_common_intro_dialog() {
       show_intro_dialog("Welcome to Freeciv-web", msg);
     }
 
+  } else if ($.getUrlVar('action') == "hack") {
+    var hack_port;
+    var hack_username;
+
+    if ($.getUrlVar('civserverport') != null) {
+      hack_port = $.getUrlVar('civserverport');
+    } else {
+      show_intro_dialog("Welcome to Freeciv-web",
+        "Hack mode disabled because civserverport wasn't specified. "
+        + "Falling back to regular mode.");
+      return;
+    }
+
+    if ($.getUrlVar("username") != null) {
+      hack_username = $.getUrlVar("username");
+    } else if (simpleStorage.hasKey("username")) {
+      hack_username = simpleStorage.get("username");
+    } else {
+      show_intro_dialog("Welcome to Freeciv-web",
+        "Hack mode disabled because \"username\" wasn't specified and no "
+        + "stored user name was found. " +
+        "Falling back to regular mode.");
+      return;
+    }
+
+    if ($.getUrlVar('autostart') == "true") {
+      autostart = true;
+    }
+
+    network_init_manual_hack(hack_port, hack_username,
+                             $.getUrlVar("savegame"));
   } else {
     show_intro_dialog("Welcome to Freeciv-web",
       "You are about to join this game server, where you can " +
diff --git a/freeciv-web/src/main/webapp/javascript/clinet.js b/freeciv-web/src/main/webapp/javascript/clinet.js
index a66376218..3b10981aa 100644
--- a/freeciv-web/src/main/webapp/javascript/clinet.js
+++ b/freeciv-web/src/main/webapp/javascript/clinet.js
@@ -33,6 +33,24 @@ var ping_last = new Date().getTime();
 var pingtime_check = 240000;
 var ping_timer = null;
 
+/**************************************************************************
+  Initialize the network communication with the server manually.
+**************************************************************************/
+function network_init_manual_hack(civserverport_manual, username_manual,
+                                  savegame)
+{
+  civserverport = civserverport_manual;
+  username = username_manual;
+
+  websocket_init();
+
+  if (savegame != null) {
+    wait_for_text("You are logged in as", function () {
+      load_game_real(savegame);
+    });
+  }
+}
+
 /****************************************************************************
   Initialized the Network communication, by requesting a valid server port.
 ****************************************************************************/
diff --git a/freeciv-web/src/main/webapp/javascript/packhand.js b/freeciv-web/src/main/webapp/javascript/packhand.js
index dbbe0be6a..3d3eaa07f 100644
--- a/freeciv-web/src/main/webapp/javascript/packhand.js
+++ b/freeciv-web/src/main/webapp/javascript/packhand.js
@@ -79,7 +79,7 @@ function handle_server_join_reply(packet)
 
     set_client_state(C_S_PREPARING);
 
-    if ($.getUrlVar('action') == "new"
+    if (($.getUrlVar('action') == "new" || $.getUrlVar('action') == "hack")
         && $.getUrlVar('ruleset') != null) {
       change_ruleset($.getUrlVar('ruleset'));
     }