diff --git a/rogueviz/rogueviz-all.cpp b/rogueviz/rogueviz-all.cpp
index 16d19f68..1a35e2fd 100644
--- a/rogueviz/rogueviz-all.cpp
+++ b/rogueviz/rogueviz-all.cpp
@@ -23,3 +23,4 @@
 #include "snow.cpp"
 #include "impossible-ring.cpp"
 #include "triangle.cpp"
+#include "sumotron.cpp"
diff --git a/rogueviz/sumotron.cpp b/rogueviz/sumotron.cpp
new file mode 100644
index 00000000..53247493
--- /dev/null
+++ b/rogueviz/sumotron.cpp
@@ -0,0 +1,156 @@
+// Hyperbolic Rogue -- sumotron puzzle
+// Copyright (C) 2011-2019 Zeno Rogue, see 'hyper.cpp' for details
+
+/** \file sumotron.cpp
+ *  \brief dual geometry puzzle generator
+ */
+
+#include "../hyper.h"
+
+namespace hr {
+
+EX namespace sumotron {
+
+map<cell*, bignum> value;
+vector<cell*> seq;
+
+bool dialog_shown = false;
+
+void sumotron_puzzle() {
+
+  clearMessages();
+
+  if(currentmap->gamestart()->wall == waSea) {
+    for(cell *c: currentmap->allcells()) {
+      c->wall = waNone;
+      c->landparam = 0xD0D0D0;
+      }
+    value.clear();
+    seq.clear();
+    }
+  
+  for(cell *c: currentmap->allcells()) {
+    bool mo = c == mouseover;
+    bool has = value.count(c);
+    if(mo && has && c == seq.back())
+      c->landparam = 0xC0FF80;
+    else if(mo && has)
+      c->landparam = 0xC0C080;
+    else if(mo)
+      c->landparam = 0xFFFF00;
+    else if(has && c == seq.back())
+      c->landparam = 0x80FF80;
+    else if(has)
+      c->landparam = 0xA0A0A0;
+    else
+      c->landparam = 0xF0F0F0;
+    }
+  getcstat = '-';
+  cmode = 0;
+  if(dialog_shown) cmode = sm::SIDE | sm::DIALOG_STRICT_X | sm::MAYDARK;
+  dynamicval<bool> dp(mapeditor::drawplayer, false);
+  gamescreen(0);
+
+  initquickqueue();
+  for(auto p: value) {
+    cell *c = p.first;
+    bignum& b = value[p.first];
+    string s = short_form(b);
+    ld size = min<ld>(1, 1.5 / isize(s));
+    for(const shiftmatrix& V: current_display->all_drawn_copies[c])
+      queuestr(V, size, s, dialog_shown ? gradient(backcolor, 0x800000, 0, .5, 1) : 0xFF0000, 1);
+    }
+
+  if(mouseover) queuecircleat(mouseover, .8, 0x800000FF);
+
+  quickqueue();
+  
+  dialog::init("SUMOTRON", iinf[itPalace].color, 150, 100);
+  dialog::addInfo("based on Sumotron by Marcos Donnantuoni");
+  
+  bignum max = 0;
+  for(auto v: value) if(v.second > max) max = v.second;
+
+  if(max > 0) {
+    dialog::addInfo("your result:");
+    dialog::addInfo(max.get_str(9999));
+    }
+  else {
+    dialog::addInfo("click to place number");
+    dialog::addInfo("arrows keys or middle button to scroll");
+    }
+  
+  dialog::addItem("undo", 'z');
+  dialog::add_action([] {
+    if(seq.empty()) return;
+    value.erase(seq.back());
+    seq.pop_back();
+    });
+  dialog::addItem("restart", 'r');
+  dialog::add_action([] {
+    value.clear();
+    seq.clear();
+    });
+  dialog::addItem("change geometry", 'g');
+  dialog::add_action(runGeometryExperiments);
+  dialog::addItem("change settings", 's');
+  dialog::add_action_push(showSettings);
+  dialog::addItem("hide menu", 'v');
+  dialog::add_action([] { dialog_shown = false; });
+  
+  if(dialog_shown) {
+    dialog::display();
+    }
+  else {
+    displayButton(8, vid.yres-vid.fsize, max.get_str(9999), 'v', 0);
+    displayButton(vid.xres-8, vid.yres-vid.fsize, XLAT("(v) menu"), 'v', 16);
+    dialog::add_key_action('v', [] { dialog_shown = true; });
+    }
+  
+  keyhandler = [] (int sym, int uni) {
+    handlePanning(sym, uni);
+    dialog::handleNavigation(sym, uni);
+    if(sym == '-' && mouseover) {
+      cell *c = mouseover;
+      if(value.count(c)) return;
+      bignum total = 0;
+      for(cell *c1: adj_minefield_cells(c))
+        if(value.count(c1)) 
+          total = total + value[c1];
+      if(total.approx_int() == 0) total = 1;
+      value[c] = total;
+      seq.push_back(c);
+      }
+    };
+  }
+
+void launch() {  
+  /* setup */
+  stop_game();
+  specialland = firstland = laCanvas;
+  canvas_default_wall = waSea;
+  start_game();
+  pushScreen(sumotron_puzzle);
+  }
+
+#if CAP_COMMANDLINE
+int rugArgs() {
+  using namespace arg;
+           
+  if(0) ;
+  else if(argis("-sumotron")) {
+    launch();
+    }
+
+  else return 1;
+  return 0;
+  }
+
+auto rug_hook = 
+  addHook(hooks_args, 100, rugArgs);
+#endif
+
+EX }
+
+EX }
+