diff --git a/graph.cpp b/graph.cpp
index c69b86b1..ad8075fa 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -3775,6 +3775,9 @@ void drawcell(cell *c, transmatrix V, int spinv, bool mirrored) {
       
       else if(patterns::whichShape == '6')
         set_floor(shBigTriangle);
+
+      else if(patterns::whichShape == '9')
+        set_floor(shFullFloor);
 #endif
 
 #if CAP_TEXTURE
diff --git a/pattern2.cpp b/pattern2.cpp
index e80ea02a..59d18ce2 100644
--- a/pattern2.cpp
+++ b/pattern2.cpp
@@ -1468,6 +1468,8 @@ namespace patterns {
     dialog::addBoolItem(XLAT("display only hexagons"), (whichShape == '6'), '6');
     dialog::addBoolItem(XLAT("display only heptagons"), (whichShape == '7'), '7');
     dialog::addBoolItem(XLAT("display the triheptagonal grid"), (whichShape == '8'), '8');
+    dialog::addBoolItem(XLAT("display full floors"), (whichShape == '9'), '9');
+
     if(cheater || autocheat) dialog::addItem(XLAT("line patterns"), 'l');
     else dialog::addInfo("enable the cheat mode to use line patterns");
 
@@ -1511,7 +1513,7 @@ namespace patterns {
         subpattern_flags ^= SPF_DOCKS;
         }
 
-      else if(uni == '6' || uni == '7' || uni == '8') {
+      else if(uni == '6' || uni == '7' || uni == '8' || uni == '9') {
         if(whichShape == uni) whichShape = 0;
         else whichShape = uni;
         }