diff --git a/doomsday/plugins/common/include/p_mapsetup.h b/doomsday/plugins/common/include/p_mapsetup.h
index 81d04463c3..ac2f32b8d2 100644
--- a/doomsday/plugins/common/include/p_mapsetup.h
+++ b/doomsday/plugins/common/include/p_mapsetup.h
@@ -46,6 +46,12 @@ void P_FinalizeMapChange(Uri const *uri);
  */
 void P_SetupMap(Uri const *uri);
 
+/**
+ * To be called to reset the local world state (e.g., when leaving a networked game).
+ * Note that @ref P_SetupMap() calls this automatically when the current map changes.
+ */
+void P_ResetWorldState();
+
 /**
  * @param mapUri  Identifier of the map to lookup the author of. Can be @c 0 in which
  *                case the author for the @em current map will be returned (if set).
diff --git a/doomsday/plugins/common/src/d_net.cpp b/doomsday/plugins/common/src/d_net.cpp
index 15f5ffe3c1..f0596806e0 100644
--- a/doomsday/plugins/common/src/d_net.cpp
+++ b/doomsday/plugins/common/src/d_net.cpp
@@ -25,6 +25,7 @@
 #include "gamesession.h"
 #include "player.h"
 #include "hu_menu.h"
+#include "p_mapsetup.h"
 #include "p_start.h"
 #include "fi_lib.h"
 
@@ -182,21 +183,25 @@ int D_NetConnect(int before)
 
 int D_NetDisconnect(int before)
 {
-    if(before) return true;
+    if(before)
+    {
+        // Free PU_MAP, Zone-allocated storage for the local world state.
+        P_ResetWorldState();
+        return true;
+    }
 
     D_NetClearBuffer();
 
     // Start demo.
     COMMON_GAMESESSION->endAndBeginTitle();
 
-    // Restore normal game state.
-    GameRuleset newRules(COMMON_GAMESESSION->rules());
+    /*GameRuleset newRules(COMMON_GAMESESSION->rules());
     newRules.deathmatch    = false;
     newRules.noMonsters    = false;
 #if __JHEXEN__
     newRules.randomClasses = false;
 #endif
-    COMMON_GAMESESSION->applyNewRules(newRules);
+    COMMON_GAMESESSION->applyNewRules(newRules);*/
 
     return true;
 }
diff --git a/doomsday/plugins/common/src/p_mapsetup.cpp b/doomsday/plugins/common/src/p_mapsetup.cpp
index 87750e0e5c..b4a3ea3d9f 100644
--- a/doomsday/plugins/common/src/p_mapsetup.cpp
+++ b/doomsday/plugins/common/src/p_mapsetup.cpp
@@ -46,8 +46,6 @@
 # define TOLIGHTIDX(c) (!((c) >> 8)? 0 : ((c) - 0x100) + 1)
 #endif
 
-static void P_ResetWorldState(void);
-
 // Our private map data structures
 xsector_t *xsectors;
 xline_t *xlines;
@@ -706,9 +704,19 @@ void P_SetupMap(Uri const *mapUri)
     // It begins...
     mapSetup = true;
 
+    ::timerGame = 0;
+    if(COMMON_GAMESESSION->rules().deathmatch)
+    {
+        int parm = CommandLine_Check("-timer");
+        if(parm && parm < CommandLine_Count() - 1)
+        {
+            ::timerGame = atoi(CommandLine_At(parm + 1)) * 35 * 60;
+        }
+    }
+
     P_ResetWorldState();
 
-    // Initialize The Logical Sound Manager.
+    // Initialize the logical sound manager.
     S_MapChange();
 
     AutoStr *mapUriStr = Uri_Compose(mapUri);
@@ -1013,10 +1021,7 @@ void P_FinalizeMapChange(Uri const *uri)
 #endif
 }
 
-/**
- * Called during map setup when beginning to load a new map.
- */
-static void P_ResetWorldState()
+void P_ResetWorldState()
 {
 #if __JHEXEN__
     static int firstFragReset = 1;
@@ -1054,16 +1059,6 @@ static void P_ResetWorldState()
 #endif
     }
 
-    timerGame = 0;
-    if(COMMON_GAMESESSION->rules().deathmatch)
-    {
-        int parm = CommandLine_Check("-timer");
-        if(parm && parm < CommandLine_Count() - 1)
-        {
-            timerGame = atoi(CommandLine_At(parm + 1)) * 35 * 60;
-        }
-    }
-
     for(int i = 0; i < MAXPLAYERS; ++i)
     {
         player_t *plr = &players[i];