diff --git a/main.lua b/main.lua
index 74bbc44..fb84939 100644
--- a/main.lua
+++ b/main.lua
@@ -21,6 +21,8 @@ function _init()
     c=caco.new(10,24,16)
     table.insert(actors,c)
     score.create()
+
+    _update=update_game
 end
 
 function text(str,x,y,col)
@@ -52,7 +54,24 @@ function draw_hab(hab,x,y,editing)
     camera(0,0)
 end
 
-function _update()
+function _update() end
+
+function update_dialog()
+    rectfill(16,16,112,50,12)
+    rect(15,15,113,51,16)
+    text("Save the map?",20,20,2)
+    text("This cannot be undone",20,27,2)
+    text("(Y)es         (N)o",25,40,2)
+
+    if btnp(KEY_N) then
+        _update=update_game
+    elseif btnp(KEY_Y) then
+        mapa_save()
+        _update=update_game
+    end
+end
+
+function update_game()
     cls(16)
 
     if mode==modes.editing then
@@ -78,8 +97,8 @@ function _update()
         elseif btnp(KEY_RETURN) then
             mode=modes.playing
             mapa_do_backup()
-        elseif btnp(KEY_S) then
-            mapa_save()
+        elseif btnp(KEY_S) and (btn(KEY_LCTRL) or btn(KEY_LGUI)) then
+            _update=update_dialog
         elseif btnp(KEY_C) then
             mapa_cycle_colors(abad.hab)
         end