diff --git a/complex.cpp b/complex.cpp
index edddfb14..467aeb02 100644
--- a/complex.cpp
+++ b/complex.cpp
@@ -2513,6 +2513,7 @@ EX namespace tortoise {
   EX map<cell*, int> emap;
   EX map<cell*, int> babymap;
   EX int last;
+  EX int last21tort;
   
   #if HDR
   enum tflag {
diff --git a/landgen.cpp b/landgen.cpp
index ee0512b7..f5180614 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -1791,11 +1791,13 @@ EX void giantLandSwitch(cell *c, int d, cell *from) {
           }
         }
       ONEMPTY {
-        if(hrand_monster(ls::hv_structure() ? 8000 : 4000) < (peace::on ? 750 : 50 + items[itBabyTortoise]*2 + yendor::hardness() * 6) && !safety) {
+        bool mk21tor = (tortoise::seek() && !((tortoise::getb(c) ^ tortoise::seekbits) & tortoise::mask) && (turncount > tortoise::last21tort + 100));
+        if((mk21tor || hrand_monster(ls::hv_structure() ? 8000 : 4000) < (peace::on ? 750 : 50 + items[itBabyTortoise]*2 + yendor::hardness() * 6)) && !safety) {
           c->monst = moTortoise;
           c->hitpoints = 3;
           auto val = tortoise::getb(c);
           tortoise::emap[c] = val;
+          if (mk21tor) tortoise::last21tort = turncount;
           }
         else if(ls::hv_structure() && hrand(10000) <= 250) {
           c->item = itCompass;
diff --git a/system.cpp b/system.cpp
index 2f683303..1e203f1e 100644
--- a/system.cpp
+++ b/system.cpp
@@ -375,6 +375,7 @@ EX void initgame() {
     sagephase = 0; hardcoreAt = 0;
     timerstopped = false;
     savecount = 0; savetime = 0;
+    tortoise::last21tort = 0;
     cheater = 0;
     if(autocheat) cheater = 1;
     if(!wfc::use_eclectic) cheater = 1;