diff --git a/bigstuff.cpp b/bigstuff.cpp
index e45550bf..fadc6b94 100644
--- a/bigstuff.cpp
+++ b/bigstuff.cpp
@@ -1771,6 +1771,21 @@ EX void build_walls(cell *c, cell *from) {
   
   else if(good_for_wall(c) && isWarpedType(c->land) && hrand(10000) < 3000 && c->land && 
     buildBarrierNowall(c, eLand(c->land ^ laWarpSea ^ laWarpCoast))) { }
+
+  else if(land_structure == lsVineWalls) {
+    int ev = emeraldval(c);
+    if((ev | 11) == 43 && c->bardir == NODIR) {
+      for(int i=0; i<c->type; i++) if(emeraldval(c->cmove(i)) == ev-4) {
+        bool oldleft = true;
+        for(int j=1; j<=3; j++)
+          if(c->modmove(i+j) && c->modmove(i+j)->mpdist < c->mpdist)
+            oldleft = false;
+        buildBarrierStrong(c, i, oldleft, getNewLand(c->land));
+        extendBarrier(c);
+        }
+      }
+    return;
+    }
   
   else if(ls::single()) return;
     
diff --git a/landgen.cpp b/landgen.cpp
index d4bad54a..9cb62eaf 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -937,7 +937,13 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
     
     case laTrollheim:
       if(fargen) {
-        if(hrand(50000) < (ls::tame_chaos() ? 1000: ls::any_chaos() ?50:5) && c->wall != waBarrier && celldist(c) >= 7 && !safety && !peace::on) {
+        int freq =
+          land_structure == lsVineWalls ? 10000 :
+          ls::wall_chaos() ? 2500 :
+          ls::tame_chaos() ? 1000 :
+          ls::any_chaos() ? 50 :
+          5;
+        if(hrand(50000) < freq && c->wall != waBarrier && celldist(c) >= 7 && !safety && !peace::on) {
           bool okay = true;
           forCellCM(c2, c) forCellCM(c3, c2) forCellCM(c4, c3) forCellCM(c5, c4) {
             cell *cx = ls::any_chaos() ? c3 : c5;
@@ -2278,7 +2284,7 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
           int hardchance = items[itRuby] + yendor::hardness();
           if(hardchance > 25) hardchance = 25;
           bool hardivy = hrand(100) < hardchance;
-          if((cgflags & qFRACTAL) ? buildIvy(c, 0, 2) : hat::in() ?  buildIvy(c, 0, 4) : (hardivy ? buildIvy(c, 1, 9) : buildIvy(c, 0, c->type)) && !peace::on)
+          if(land_structure == lsVineWalls ? buildIvy(c, 0, 2) : (cgflags & qFRACTAL) ? buildIvy(c, 0, 2) : hat::in() ?  buildIvy(c, 0, 4) : (hardivy ? buildIvy(c, 1, 9) : buildIvy(c, 0, c->type)) && !peace::on)
             c->item = itRuby;
           }
         }
diff --git a/landlock.cpp b/landlock.cpp
index d1b3b016..828897cb 100644
--- a/landlock.cpp
+++ b/landlock.cpp
@@ -81,7 +81,7 @@ EX eLand firstland = laIce;
 EX eLand specialland = laIce;
 
 #if HDR
-enum eLandStructure { lsNiceWalls, lsChaos, lsPatchedChaos, lsTotalChaos, lsChaosRW, lsWallChaos, lsSingle, lsNoWalls, lsHorodisks, lsVoronoi, lsLandscape, lsCrossWalls, lsGUARD };
+enum eLandStructure { lsNiceWalls, lsChaos, lsPatchedChaos, lsTotalChaos, lsChaosRW, lsWallChaos, lsSingle, lsNoWalls, lsHorodisks, lsVoronoi, lsLandscape, lsCrossWalls, lsVineWalls, lsGUARD };
 #endif
 
 EX eLandStructure land_structure;
@@ -90,9 +90,9 @@ EX namespace ls {
 
 EX bool single() { return land_structure == lsSingle; }
 
-EX bool any_chaos() { return among(land_structure, lsChaos, lsPatchedChaos, lsWallChaos, lsTotalChaos, lsChaosRW, lsCrossWalls, lsLandscape); }
+EX bool any_chaos() { return among(land_structure, lsChaos, lsPatchedChaos, lsWallChaos, lsTotalChaos, lsChaosRW, lsCrossWalls, lsVineWalls, lsLandscape); }
 EX bool std_chaos() { return land_structure == lsChaos; }
-EX bool wall_chaos() { return among(land_structure, lsWallChaos, lsCrossWalls); }
+EX bool wall_chaos() { return among(land_structure, lsWallChaos, lsCrossWalls, lsVineWalls); }
 EX bool patched_chaos() { return land_structure == lsPatchedChaos; }
 
 EX bool any_order() { return among(land_structure, lsNiceWalls, lsNoWalls, lsHorodisks, lsVoronoi); }
@@ -122,6 +122,7 @@ EX int chaoticity() {
 EX int ls_mul() {
   if(land_structure == lsWallChaos) return 2;
   if(land_structure == lsCrossWalls) return 3;
+  if(land_structure == lsVineWalls) return 3;
   return 1;
   }
 
@@ -129,6 +130,7 @@ EX int ls_mul() {
 EX int ls_mul_big() {
   if(land_structure == lsWallChaos) return 5;
   if(land_structure == lsCrossWalls) return 10;
+  if(land_structure == lsVineWalls) return 10;
   return 1;
   }
 
@@ -161,6 +163,8 @@ EX string land_structure_name(bool which) {
       return XLAT("wall-less");
     case lsCrossWalls:
       return XLAT("excessive crossing walls");
+    case lsVineWalls:
+      return XLAT("regular walls");
     default:
       return "error structure";
     }
@@ -183,6 +187,8 @@ EX void fix_land_structure_choice() {
     land_structure = lsChaos;
   if(!nice_walls_available() && land_structure == lsCrossWalls)
     land_structure = lsChaos;
+  if(land_structure == lsVineWalls && (geometry != gNormal || !BITRUNCATED))
+    land_structure = lsNiceWalls;
   if(ls::hv_structure() && (!hyperbolic || bt::in() || quotient))
     land_structure = lsSingle;
   if(walls_not_implemented() && among(land_structure, lsChaos, lsNoWalls))
@@ -1171,7 +1177,7 @@ EX land_validity_t& land_validity(eLand l) {
   if(l == laWhirlwind && hyperbolic_not37)
     return pattern_incompatibility;
 
-  bool better_mirror = !geometry && STDVAR && !ls::hv_structure() && !among(land_structure, lsTotalChaos, lsPatchedChaos, lsLandscape);
+  bool better_mirror = !geometry && STDVAR && !ls::hv_structure() && !among(land_structure, lsTotalChaos, lsPatchedChaos, lsLandscape, lsVineWalls);
 
   // available only in non-standard geometries
   if(l == laMirrorOld && better_mirror)