diff --git a/rogueviz/ads/ads-game.cpp b/rogueviz/ads/ads-game.cpp
new file mode 100644
index 00000000..8001086c
--- /dev/null
+++ b/rogueviz/ads/ads-game.cpp
@@ -0,0 +1,64 @@
+#include "../rogueviz.h"
+
+#include "math.cpp"
+#include "globals.cpp"
+#include "shapes.cpp"
+#include "map.cpp"
+#include "control.cpp"
+#include "display.cpp"
+#include "menu.cpp"
+
+namespace hr {
+
+namespace ads_game {
+
+void change_default_key(int key, int val) {
+  char* t = multi::scfg.keyaction;
+  t[key] = val;
+  #if CAP_CONFIG
+  set_saver_default(t[key]);
+  #endif
+  }
+
+void run_ads_game() {
+
+  change_default_key('s', 16 + 0);
+  change_default_key('a', 16 + 1);
+  change_default_key('w', 16 + 2);
+  change_default_key('d', 16 + 3);
+  change_default_key('f', 16 + 4);
+  change_default_key('p', 16 + 5);
+  change_default_key('t', 16 + 6);
+  change_default_key('o', 16 + 7);
+  change_default_key('m', 16 + 8);
+
+  nomap = true;
+  no_find_player = true;
+  vctr = cwt.at;
+  cell *c = hybrid::get_where(vctr).first;
+  hybrid::in_underlying_geometry([&] {
+    gen_terrain(c, ci_at[c], -2);
+    forCellEx(c1, c) ci_at[c1].type = wtNone;
+    ci_at[c].type = wtNone;
+    });
+  vctrV = ads_matrix(Id, 0);
+  rogueviz::rv_hook(hooks_prestats, 100, view_ads_game);
+  rogueviz::rv_hook(hooks_handleKey, 0, handleKey);
+  rogueviz::rv_hook(shmup::hooks_turn, 0, ads_turn);
+  }
+
+auto shot_hooks = 
+  arg::add3("-ads-game", run_ads_game)
++ addHook(hooks_configfile, 100, [] {
+    param_f(simspeed, "ads_game_simspeed")
+    -> editable(0, 2*TAU, TAU/4, "game speed", "Controls the speed of the game.", 's');
+    param_f(accel, "ads_game_accel")
+    -> editable(0, 30, 1, "acceleration", "Controls the speed of your ship's acceleration.", 'a');
+    param_b(auto_rotate, "ads_auto_rotate")
+    -> editable("automatically rotate the screen", 'r');
+    param_b(view_proper_times, "ads_display")
+    -> editable("display the proper times", 't');
+    });
+
+}
+}
diff --git a/rogueviz/ads/control.cpp b/rogueviz/ads/control.cpp
new file mode 100644
index 00000000..f6f1194d
--- /dev/null
+++ b/rogueviz/ads/control.cpp
@@ -0,0 +1,160 @@
+namespace hr {
+
+namespace ads_game {
+
+vector<string> move_names = { "acc down", "acc left", "acc up", "acc right", "fire", "pause", "display times", "switch spin", "menu" };
+
+void fire() {
+  auto g = hybrid::get_where(vctr);
+  auto c = g.first;
+  if(g.second != 0) println(hlog, "WARNING: vctr not zeroed");
+
+  ads_matrix S0 = ads_inverse(current * vctrV) * spin(ang*degree);
+
+  ads_matrix S1 = S0 * lorentz(0, 2, 3); // 0.995c
+  
+  auto& ro = ci_at[c].rocks;
+  ro.emplace_back(rockinfo{1, S1, 0xC0C0FFFF });
+  auto& r = ro.back();
+
+  ads_matrix Scell(Id, 0);    
+  cell *lcell = vctr;
+  auto wcell = hybrid::get_where(lcell);
+  
+  int steps = 0;
+
+  compute_life(vctr, unshift(r.at), [&] (cell *c1, ld t) {
+    if(true) for(int i=0; i<lcell->type; i++) {
+      auto lcell1 = lcell->cmove(i);
+      auto wcell1 = hybrid::get_where(lcell1);
+      if(wcell1.first == c1) {
+        Scell = Scell * currentmap->adj(lcell, i);
+        optimize_shift(Scell);
+        lcell = lcell1;
+        wcell = wcell1;
+        adjust_to_zero(Scell, wcell, cgi.plevel);
+        steps++;
+        lcell = hybrid::get_at(wcell.first, 0);
+        break;
+        }
+      }
+    if(true) if(wcell.first != c1) {
+      println(hlog, "warning: got lost after ", steps, " steps");
+      println(hlog, wcell);
+      println(hlog, c1);
+      println(hlog, "their distance is ", PIU(celldistance(wcell.first, c1)));
+      return true;
+      }
+    auto& ci = ci_at[c1];
+    hybrid::in_underlying_geometry([&] {
+      gen_terrain(c1, ci);
+      gen_rocks(c1, ci, 2);
+      });
+    if(among(ci.type, wtSolid, wtDestructible)) {
+      r.life_end = t;
+
+      auto Scell_inv = ads_inverse(Scell);
+      Scell_inv = Scell_inv * r.at;
+      Scell_inv = Scell_inv * ads_matrix(Id, t);
+      optimize_shift(Scell_inv);
+
+      auto X = ads_inverse(Scell);
+      X = X * (r.at * ads_matrix(Id, t));
+      optimize_shift(X);
+
+      ads_matrix prel = ads_inverse(S0) * r.at * ads_matrix(Id, t);
+
+      println(hlog, "crashed: proper time = ", t/TAU, " wall time = ", Scell_inv.shift / TAU, " player time = ", (prel.shift+ship_pt) / TAU, " start = ", ship_pt / TAU);
+      if(abs(X.shift - Scell_inv.shift) > .2) {
+        println(hlog, "INTRANSITIVITY ERROR! ", X.shift, " vs ", Scell_inv.shift);
+        exit(1);
+        }
+
+      return true;
+      }
+    return false;
+    });
+  }
+
+bool handleKey(int sym, int uni) {
+  /*
+  if(uni == 'p') paused = !paused;
+  
+  if(among(uni, 'a', 'd', 's', 'w')) return true;
+  
+  if(uni == 't') { view_proper_times = !view_proper_times; return true; }
+  if(uni == 'o') { auto_rotate = !auto_rotate; return true; }
+  
+  if(uni == 'f') fire();
+  */
+
+  if(sym > 0 && sym < 512 && (cmode & sm::NORMAL)) {
+    char* t = multi::scfg.keyaction;
+    if(t[sym] >= 16 && t[sym] < 32) return true;
+    }
+  
+  return false;
+  }
+
+void apply_lorentz(transmatrix lor) {
+  current = ads_matrix(lor, 0) * current;
+  }
+
+bool ads_turn(int idelta) {
+  multi::handleInput(idelta);
+  ld delta = idelta / anims::period;
+  
+  if(!(cmode & sm::NORMAL)) return false;
+
+  auto& a = multi::actionspressed;
+  auto& la = multi::lactionpressed;
+  
+  vector<int> ap;
+  for(int i=0; i<NUMACT; i++) if(a[i]) ap.push_back(i);
+  
+  if(a[16+4] && !la[16+4]) fire();
+  if(a[16+5] && !la[16+5]) paused = !paused;
+  if(a[16+6] && !la[16+6]) view_proper_times = !view_proper_times;
+  if(a[16+7] && !la[16+7]) auto_rotate = !auto_rotate;
+  if(a[16+8] && !la[16+8]) pushScreen(game_menu);    
+
+  if(!paused) {
+    dynamicval<eGeometry> g(geometry, geometry == gRotSpace ? geometry : gCubeTiling);
+    
+    /* proper time passed */
+    ld pt = delta * simspeed;
+
+    bool left = a[16+1];
+    bool right = a[16+3];
+    bool up = a[16+2];
+    bool down = a[16];
+    
+    if(left) apply_lorentz(lorentz(0, 2, delta*accel)), ang = 180;
+    if(right) apply_lorentz(lorentz(0, 2, -delta*accel)), ang = 0;
+    if(up) apply_lorentz(lorentz(1, 2, delta*accel)), ang = 90; 
+    if(down) apply_lorentz(lorentz(1, 2, -delta*accel)), ang = 270;
+    
+    if(left && up) ang = 135;
+    if(left && down) ang = 225;
+    if(right && up) ang = 45;
+    if(right && down) ang = 315;
+
+    current.T = cspin(3, 2, pt) * current.T;
+    optimize_shift(current);    
+    hassert(eqmatrix(chg_shift(current.shift) * current.T, unshift(current)));
+    
+    if(auto_rotate)
+      current.T = cspin(1, 0, pt) * current.T;
+    else
+      ang += pt / degree;
+
+    ship_pt += pt;
+    }
+  
+  fixmatrix_ads(current.T);
+  fixmatrix_ads(vctrV.T);
+
+  return true;
+  }
+
+}}
diff --git a/rogueviz/ads/display.cpp b/rogueviz/ads/display.cpp
new file mode 100644
index 00000000..be90882d
--- /dev/null
+++ b/rogueviz/ads/display.cpp
@@ -0,0 +1,225 @@
+namespace hr {
+
+namespace ads_game {
+
+flatresult findflat(shiftpoint h) {
+  return cross0(current * rgpushxto0(h));
+  }
+
+void draw_game_cell(cell *cs, ads_matrix V, ld plev) {  
+  auto g = PIA( hybrid::get_where(cs) );
+  adjust_to_zero(V, g, plev);
+  auto c = g.first;
+  
+  flatresult center;
+  vector<flatresult> hlist;
+
+  hybrid::in_actual([&]{    
+    for(int i=0; i<=c->type; i++) {
+      hyperpoint ha = hybrid::get_corner(c, i, 2, 0);
+      hlist.push_back(findflat(V * ha));
+      }
+    center = findflat(V * C0);
+    });
+  
+  if(1) {
+    ld d = hdist0(center.h);
+    if(d < vctr_dist) vctr_dist = d, vctr = PIA( hybrid::get_at(c, 0) ), vctrV = V;
+    }
+
+  auto& ci = ci_at[c];
+  if(ci.mpd_terrain > 0) {
+    if(!gen_budget) return;
+    gen_budget--;
+    }
+  gen_terrain(c, ci);
+  gen_rocks(c, ci, 0);
+
+  auto& t = ci.type;
+
+  if(t == wtGate) {
+    ld minv = hlist[0].shift;
+    ld maxv = hlist[0].shift;
+    for(auto& h: hlist) {
+      ld v = h.shift;
+      if(v < minv) minv = v;
+      if(v > maxv) maxv = v;
+      }
+  
+    auto draw_slice = [&] (ld a, ld b, color_t col) {
+      vector<hyperpoint> slice;
+      for(int i=0; i<c->type; i++) {
+        if(hlist[i].shift >= a && hlist[i].shift <= b)
+          slice.push_back(hlist[i].h);
+        if((hlist[i].shift < a) ^ (hlist[i+1].shift < a)) {
+          ld p = ilerp(hlist[i].shift, hlist[i+1].shift, a);
+          hyperpoint h1 = lerp(hlist[i].h, hlist[i+1].h, p);
+          slice.push_back(h1);
+          }
+        if((hlist[i].shift > b) ^ (hlist[i+1].shift > b)) {
+          ld p = ilerp(hlist[i].shift, hlist[i+1].shift, b);
+          hyperpoint h1 = lerp(hlist[i].h, hlist[i+1].h, p);
+          slice.push_back(h1);
+          }
+        if(hlist[i+1].shift < a && hlist[i].shift > b)
+          swap((&slice.back())[-1], slice.back()); 
+        }
+      if(isize(slice) < 3) return;
+      for(auto e: slice) curvepoint(e);
+      curvepoint(slice[0]);
+      queuecurve(shiftless(Id), 0xFFFFFFFF, col, PPR::LINE);
+      };
+    
+    for(int v=floor(minv); v<maxv+1; v++) {
+      draw_slice(v, v+1, (v & 3) ? 0x080828FF : 0xA04020FF);
+      }
+    }
+  else {
+    color_t col = 
+      t == wtSolid ? 0x603000FF :
+      t == wtDestructible ? 0x301800FF :
+      0x181818FF;
+
+    for(auto h: hlist) curvepoint(h.h);
+    addaura(shiftless(center.h), col >> 8, 0);
+    queuecurve(shiftless(Id), 0x101010FF, col, PPR::WALL);
+    }
+
+  if(view_proper_times) {
+    string str = format(tformat, center.shift / TAU);
+    queuestr(shiftless(rgpushxto0(center.h)), .1, str, 0xFF4040, 8);
+    }
+
+  for(auto& rock: ci.rocks) {
+    
+    vector<hyperpoint> pts;
+    
+    vector<ld>& shape = rock.type ? shape_missile : shape_rock;
+    
+    flatresult fr_main;
+    if(1) hybrid::in_actual([&]{
+      dynamicval<eGeometry> b(geometry, gRotSpace);
+      auto h = V * rock.at;
+      fr_main = cross0(current * h);
+      });
+    if(fr_main.shift < rock.life_start || fr_main.shift > rock.life_end) continue;
+
+    for(int i=0; i<isize(shape); i += 2) {
+      hybrid::in_actual([&]{
+        auto h = V * rock.at * rots::uxpush(shape[i]) * rots::uypush(shape[i+1]);
+        flatresult f = cross0(current * h);
+        pts.push_back(f.h);
+        });
+      }
+
+    for(auto h: pts) curvepoint(h);
+    curvepoint(pts[0]);
+    queuecurve(shiftless(Id), rock.type == 1 ? 0xFF0000FF : 0x000000FF, rock.col, PPR::LINE);
+
+    if(view_proper_times) {
+      string str = format(tformat, fr_main.shift / TAU);
+      queuestr(shiftless(rgpushxto0(fr_main.h)), .1, str, 0xFFFFFF, 8);
+      }
+    }
+  
+  }
+
+bool view_ads_game() {
+  auto plev = cgi.plevel; /* we are in another CGI so we have no access to that... */
+  gen_budget = 5;
+  
+  flatresult base;
+  if(1) {  
+    // todo rebase
+    base = findflat(ads_point(C0, 0));
+    // println(hlog, base.h);
+    ld ebase = 0;
+    hybrid::in_underlying_geometry([&]{
+      ebase = hdist0(base.h);
+      // println(hlog, "dist base pre = ", hdist0(base.h), " at ", base.shift);
+      });
+    // println(hlog, base.h[2]*base.h[2] - base.h[1]*base.h[1] - base.h[0] * base.h[0]);
+    
+    for(int u=0; u<30; u++) {
+      auto bcurrent = current;
+      
+      transmatrix T = spin(12*degree*u) * xpush(0.5);
+  
+      current.T = current.T * T;
+      auto base1 = findflat(ads_point(C0, 0));
+      ld ebase1 = 0;
+      hybrid::in_underlying_geometry([&] {
+        ebase1 = hdist0(base1.h);
+        });
+      if(ebase1 < ebase) { vctrV.T = inverse(T) * vctrV.T; }
+      else { current = bcurrent; }
+      }
+    }
+  // current = current * gpushxto0(p);
+  // vctrV = rgpushxto0(p) * vctrV;
+
+  hybrid::in_underlying_geometry([&] {
+    dynamicval<eModel> p(pmodel, mdDisk);
+    check_cgi();
+    cgi.require_basics();
+    cgi.require_shapes();
+    ptds.clear();
+    calcparam();
+    clearaura();
+    make_shape();
+    
+    set<cell*> visited;
+    queue<pair<cell*, ads_matrix>> dq;
+    auto visit = [&] (cell *c, const ads_matrix& V) {
+      auto w = hybrid::get_where(c);
+      if(visited.count(w.first)) return;
+      visited.insert(w.first);
+      dq.emplace(c, V);
+      };
+    
+    hybrid::in_actual([&] {
+      dynamicval<eGeometry> b(geometry, gRotSpace);
+      visit(vctr, vctrV);
+      vctr_dist = HUGE_VAL;
+      });
+    
+    int i = 0;
+    while(!dq.empty()) {
+      i++; if(i > 1000) break;
+      auto& p = dq.front();
+      cell *c = p.first;
+      ads_matrix V = p.second;
+      dq.pop();
+
+      draw_game_cell(c, V, plev);
+      
+      hybrid::in_actual([&] {
+        for(int i=0; i<c->type-2; i++) {
+          cell *c2 = c->cmove(i);
+          auto V1 = V * currentmap->adj(c, i);
+          optimize_shift(V1);
+          visit(c2, V1);
+          }
+        });
+      }
+
+    if(true) {
+      poly_outline = 0xFF;
+      queuepolyat(shiftless(spin(ang*degree) * Id), shShip, 0x2020FFFF, PPR::LINE);
+
+      if(view_proper_times) {
+        string str = format(tformat, ship_pt / TAU);
+        queuestr(shiftless(Id), .1, str, 0xFFFFFF, 8);
+        }
+      }
+
+    if(false) queuepolyat(shiftless(rgpushxto0(base.h)), cgi.shGem[0], 0x2020FFFF, PPR::LINE);
+    
+    drawqueue();
+    drawaura();
+    });
+  check_cgi();
+  return true;
+  }
+
+}}
diff --git a/rogueviz/ads/globals.cpp b/rogueviz/ads/globals.cpp
new file mode 100644
index 00000000..56969e81
--- /dev/null
+++ b/rogueviz/ads/globals.cpp
@@ -0,0 +1,43 @@
+namespace hr {
+
+namespace ads_game {
+
+/** simulation speed */
+ld simspeed = TAU;
+
+/** by how much do WAS keys accelerate */
+ld accel = 6;
+
+/** transform world coordinates to ship coordinates */
+ads_matrix current;
+
+/** SL cell closest to the ship */
+cell *vctr;
+
+/** world coordinates of vctr -- technically, this is a shiftmatrix */
+ads_matrix vctrV;
+
+/** how far is vctr from the ship */
+ld vctr_dist;
+
+/** how is the ship shape rotated */
+ld ang = 0;
+
+/** ship's current proper time */
+ld ship_pt;
+
+/** is the game paused */
+bool paused;
+
+/** auto-rotate the screen */
+bool auto_rotate = false;
+
+/** should we display the proper times of all objects */
+bool view_proper_times = false;
+
+/** format for displaying time */
+const char *tformat = "%.2f";
+
+void game_menu();
+
+}}
diff --git a/rogueviz/ads/map.cpp b/rogueviz/ads/map.cpp
new file mode 100644
index 00000000..d2b954cd
--- /dev/null
+++ b/rogueviz/ads/map.cpp
@@ -0,0 +1,141 @@
+namespace hr {
+
+namespace ads_game {
+
+struct rockinfo {
+  int type;
+  ads_matrix at;
+  color_t col;
+  
+  ld life_start, life_end;
+  
+  rockinfo(int t, const ads_matrix& T, color_t _col) : type(t), at(T), col(_col) { 
+    life_start = -HUGE_VAL;
+    life_end = HUGE_VAL;
+    }
+  };
+
+enum eWalltype { wtNone, wtDestructible, wtSolid, wtGate };
+
+struct cellinfo {
+  int mpd_terrain; /* 0 = fully generated terrain */
+  int rock_dist; /* rocks generated in this radius */
+  vector<rockinfo> rocks;
+  eWalltype type;
+  cellinfo() {
+    mpd_terrain = 4;
+    rock_dist = -1;
+    type = wtNone;
+    }
+  };
+
+std::unordered_map<cell*, cellinfo> ci_at;
+
+using worldline_visitor = std::function<bool(cell*, ld)>;
+
+void compute_life(cell *c, transmatrix S1, const worldline_visitor& wv) {
+  ld t = 0;
+
+  int iter = 0;
+  cell *cur_c = c;
+  auto cur_w = hybrid::get_where(c);
+  while(t < 2 * M_PI) {
+    iter++;
+    auto last_w = cur_w;
+    auto next_w = cur_w;
+    transmatrix next_S1;
+    ld next_t;
+    ld last_time = t;
+    cell *next_c = nullptr;
+    binsearch(t, t+M_PI/2, [&] (ld t1) { 
+      S1 = S1 * chg_shift(t1 - last_time);
+      last_time = t1;
+      virtualRebase(cur_c, S1);
+      cur_w = hybrid::get_where(cur_c);
+      if(cur_w.first != last_w.first) {
+        next_c = cur_c;
+        next_w = cur_w;
+        next_S1 = S1;
+        next_t = t1;
+        return true;
+        }
+      return false;
+      }, 20);
+    if(!next_c) return;
+    S1 = next_S1;
+    cur_w = next_w;
+    t = next_t;
+    cur_c = next_c;
+    if(iter > 1000) {
+      println(hlog, "compute_life c=", cur_c, " w=", cur_w, "t=", t, " S1=", S1);
+      fixmatrix_ads(S1);
+      }
+    if(iter > 1100) break;
+    if(wv(cur_w.first, t)) break;
+    }
+  }
+
+map<int, int> genstats;
+
+int gen_budget;
+
+void gen_terrain(cell *c, cellinfo& ci, int level = 0) {
+  if(level >= ci.mpd_terrain) return;
+  if(ci.mpd_terrain > level + 1) gen_terrain(c, ci, level+1);
+  forCellCM(c1, c) gen_terrain(c1, ci_at[c1], level+1);
+  genstats[level]++;
+  
+  if(level == 2) {
+    int r = hrand(100);
+    if(r < 5) {
+      forCellCM(c1, c) if(hrand(100) < 50)
+        forCellCM(c2, c1)  if(hrand(100) < 50)
+          if(ci_at[c2].type == wtNone) ci_at[c2].type = wtDestructible;
+      }
+    else if(r < 10) {
+      forCellCM(c1, c) if(hrand(100) < 50)
+        forCellCM(c2, c1)  if(hrand(100) < 50)
+          if(ci_at[c2].type < wtSolid)
+            ci_at[c2].type = wtSolid;
+      }
+    else if(r < 12)
+      ci_at[c].type = wtGate;
+    }
+  ci.mpd_terrain = level;
+  }
+
+void gen_rocks(cell *c, cellinfo& ci, int radius) {
+  if(radius <= ci.rock_dist) return;
+  if(ci.rock_dist < radius - 1) gen_rocks(c, ci, radius-1);
+  forCellCM(c1, c) gen_rocks(c1, ci_at[c1], radius-1);
+  if(geometry != gNormal) { println(hlog, "wrong geometry detected in gen_rocks 1!");  exit(1); }
+
+  if(radius == 0) {
+    hybrid::in_actual([&] {
+      int q = rpoisson(.05);
+      
+      auto add_rock = [&] (rockinfo&& r) {
+        if(geometry != gRotSpace) { println(hlog, "wrong geometry detected in gen_rocks 2!");  exit(1); }
+        compute_life(hybrid::get_at(c, 0), unshift(r.at), [&] (cell *c, ld t) {
+          auto& ci = ci_at[c];
+          hybrid::in_underlying_geometry([&] { gen_terrain(c, ci); });
+          ci.type = wtNone;
+          return false;
+          });
+        ci.rocks.emplace_back(r);
+        };
+      
+      for(int i=0; i<q; i++) {
+        int kind = hrand(100);
+        if(kind < 50) 
+          add_rock(rockinfo(0, ads_matrix(rots::uxpush(randd() * .6 - .3) * rots::uypush(randd() * .6 - .3)), 0xC0C0C0FF));
+        else
+          add_rock(rockinfo(0, ads_matrix(rots::uypush(randd() * .6 - .3) * lorentz(0, 3, 0.5 + randd() * 1)), 0xC04040FF));
+        }        
+      });
+    }
+  ci.rock_dist = radius;
+  }
+
+
+}}
diff --git a/rogueviz/ads/math.cpp b/rogueviz/ads/math.cpp
new file mode 100644
index 00000000..77bdecf8
--- /dev/null
+++ b/rogueviz/ads/math.cpp
@@ -0,0 +1,163 @@
+#include "../rogueviz.h"
+
+namespace hr {
+
+namespace ads_game {
+
+static constexpr auto TAU = 2*M_PI;
+
+/** hyperpoint represents a point in the SL(2,R)-like AdS, while ads_point represents a point in the universal cover */
+struct ads_point : shiftpoint {
+  ads_point(hyperpoint _h = C0, ld _s = 0) { h = _h; shift = _s; }
+  ads_point(shiftpoint _s) : shiftpoint(_s) {}
+  };
+
+/** similarly, ads_matrix represents a transformation of the universal cover space */
+struct ads_matrix : shiftmatrix {
+  ads_matrix(transmatrix _h = Id, ld _s = 0) { T = _h; shift = _s; }
+  ads_point operator* (ads_point);
+  ads_matrix operator* (ads_matrix);
+  ads_point operator* (hyperpoint h) { return ads_point(T*h, shift); }
+  ads_matrix operator* (transmatrix h) { return ads_matrix(T*h, shift); }
+  ads_matrix(shiftmatrix _s) : shiftmatrix(_s) {}
+  };
+
+ads_point kz(ads_point x) { x.h = hr::kz(x.h); x.shift = hr::kz(x.shift); return x; }
+ads_matrix kz(ads_matrix x) { x.T = hr::kz(x.T); x.shift = hr::kz(x.shift); return x; }
+
+/** Lorentz boost. */
+transmatrix lorentz(int a, int b, ld v) {
+  transmatrix T = Id;
+  T[a][a] = T[b][b] = cosh(v);
+  T[a][b] = T[b][a] = sinh(v);
+  return T;
+  }
+
+void fixmatrix_ads(transmatrix& T) {
+  for(int x=0; x<4; x++) for(int y=x; y>=0; y--) {
+    ld dp = 0;
+    for(int z=0; z<4; z++) dp += T[z][x] * T[z][y] * sig(z);
+    
+    if(y == x) dp = 1 - sqrt(sig(x)/dp);
+    else dp *= sig(y);
+
+    for(int z=0; z<4; z++) T[z][x] -= dp * T[z][y];
+    }
+  }
+
+/* get_at(g) is at V; adjust g.second==0 and V accordingly */
+void adjust_to_zero(ads_matrix& V, pair<cell*, int>& g, ld plev) {
+  V.shift -= plev * g.second;
+  g.second = 0;
+  }
+
+/** by how many cycles should we shift */
+ld get_shift_cycles(ld shift) {
+  return floor(shift / TAU + .5) * TAU;
+  }
+
+/** this is uzpush(-x) */
+transmatrix chg_shift(ld x) {
+  return cspin(2, 3, x) * cspin(0, 1, x);
+  }
+
+ads_point ads_matrix::operator*(ads_point h) {
+  auto& T = *this;
+  optimize_shift(h);
+  ld sh = get_shift_cycles(h.shift);
+  h.shift -= sh;
+  auto res0 = T;
+  optimize_shift(res0);
+  auto res1 = res0 * chg_shift(h.shift);
+  optimize_shift(res1);
+  res1.shift += get_shift_cycles(res0.shift - res1.shift);
+  auto res2 = res1 * h.h;
+  optimize_shift(res2);
+  res2.shift += get_shift_cycles(res1.shift - res2.shift);
+  res2.shift += sh;  
+  return res2;
+  }
+
+ads_matrix ads_matrix::operator*(ads_matrix h) {
+  auto& T = *this;
+  optimize_shift(h);
+  ld sh = get_shift_cycles(h.shift);
+  h.shift -= sh;
+
+  auto res0 = T;
+  optimize_shift(res0);
+  auto res1 = res0 * chg_shift(h.shift);
+  optimize_shift(res1);
+  res1.shift += get_shift_cycles(res0.shift - res1.shift);
+  auto res2 = res1 * h.T;
+  optimize_shift(res2);
+  res2.shift += get_shift_cycles(res1.shift - res2.shift);
+  res2.shift += sh;
+  return res2;
+  }
+
+ads_matrix ads_inverse(const ads_matrix& T) {
+  ads_matrix res(inverse(unshift(T)), 0);
+  ads_matrix m = res * T;
+  optimize_shift(m);
+  res.shift -= m.shift;
+  return res;
+  }
+
+struct flatresult {
+  hyperpoint h;
+  ld shift;
+  };
+
+extern ads_matrix current;
+
+/** T represents a worldline of some object; find when does this worldline cross the time=0 slice.
+ *  shift is T's proper time at the point of crossing, and h=(x,y,z) is the Minkowski hyperboloid point where it crosses.
+ **/
+
+flatresult cross0(ads_matrix hz) {
+  
+  transmatrix deg90 = chg_shift(90*degree);
+  hyperpoint uhz = unshift(hz * C0);
+  hyperpoint uhz1 = unshift(hz * deg90 * C0);
+
+  ld cost, sint, tant;
+  ld t;
+  
+  if(uhz1[2]) {
+    tant = - uhz[2] / uhz1[2];
+    cost = 1 / sqrt(1 + tant * tant);
+    sint = tant * cost;
+    t = atan2(sint, cost);
+    }
+  else {
+    cost = 0;
+    sint = 1;
+    t = 90*degree;
+    }
+  
+  hyperpoint uhzt = unshift(hz * chg_shift(t) * C0);
+  if(uhzt[3] < 0) { t += 180*degree; uhzt = -uhzt; }
+
+  tie(uhzt[2], uhzt[3]) = make_pair(uhzt[3], -uhzt[2]);
+  t += get_shift_cycles(-hz.shift-t);
+  
+  return flatresult{uhzt, t};
+  }
+
+/** sample from Poisson distribution */
+int rpoisson(ld lambda) {
+  ld prob = randd();
+  ld poisson = exp(-lambda);
+  int cnt = 0;
+  while(cnt < 2*lambda+100) {
+    if(prob < poisson) break;
+    prob -= poisson;
+    cnt++;
+    poisson *= lambda / cnt;
+    }
+  return cnt;
+  }
+
+}
+}
diff --git a/rogueviz/ads/menu.cpp b/rogueviz/ads/menu.cpp
new file mode 100644
index 00000000..c0b06635
--- /dev/null
+++ b/rogueviz/ads/menu.cpp
@@ -0,0 +1,39 @@
+namespace hr {
+
+namespace ads_game {
+
+void game_menu() {
+  dialog::init(XLAT("AdS game settings"), 0xC0C0FFFF, 150, 100);
+  
+  add_edit(simspeed);
+  add_edit(accel);
+  add_edit(view_proper_times);
+  add_edit(auto_rotate);
+  
+  dialog::addItem("configure keys", 'k');
+  dialog::add_action_push(multi::get_key_configurer(1, move_names, "Nilrider keys"));
+
+  #if CAP_AUDIO
+  add_edit(effvolume);
+  add_edit(musicvolume);
+  #endif
+
+  dialog::addItem("RogueViz settings", 'r');
+  dialog::add_key_action('r', [] {
+    pushScreen(showSettings);
+    });
+
+  #if CAP_FILES && !ISWEB
+  dialog::addItem("save the current config", 's');
+  dialog::add_action([] {
+    dynamicval<eGeometry> g(geometry, gNormal);
+    saveConfig();
+    });
+  #endif
+
+  dialog::addBreak(100);
+  dialog::addBack();
+  dialog::display();
+  }
+
+}}
diff --git a/rogueviz/ads/shapes.cpp b/rogueviz/ads/shapes.cpp
new file mode 100644
index 00000000..b83a976e
--- /dev/null
+++ b/rogueviz/ads/shapes.cpp
@@ -0,0 +1,31 @@
+namespace hr {
+
+namespace ads_game {
+
+hpcshape shShip;
+bool made;
+
+vector<ld> shape_rock = { -0.0176894, 0.0952504,  0.0278998, 0.0966286,  0.0686721, 0.0455547,  0.110983, 0.0122558,  0.0994024, -0.0483395,  0.0517039, -0.0802772,  -0.00271848, -0.0706804,  -0.0564861, -0.08575,  -0.100087, -0.0483411,  -0.100031, -0.0102072,  -0.0761486, 0.0292356,  -0.0639653, 0.077575 };
+vector<ld> shape_missile = { 
+
+/*  0.201073, 0.00513228,  0.161595, 0.0253201,  -0.135796, 0.0245209,  -0.194281, 0.0372705,
+  -0.194281, -0.0372705, -0.135796, -0.0245209, 0.161595, -0.0253201, 0.201073, -0.00513228 */
+  0.04, 0, 0.01, 0.02, -0.02, 0.02, -0.02, -0.02, 0.01, -0.02,
+  };
+  
+void make_shape() {
+  if(made) return;
+  made = true;
+  vector<ld> ship = {
+    0.100145, 0.00834541,  0.0810058, 0.0190602,  0.0356926, 0.0237951,  0.0619128, 0.0309564,  0.0631121, 0.0369146,  0.0333191, 0.038079,  -0.0333481, 0.0702692,  -0.0321308, 0.041651,  -0.0380849, 0.0416554,  -0.0380749, 0.0261765,  -0.0273608, 0.023792
+    };
+  cgi.bshape(shShip, PPR::MONSTER_BODY);
+  int N = isize(ship);
+  for(int i=0; i<N; i += 2) cgi.hpcpush(hpxy(ship[i] - .03, ship[i+1]));
+  for(int i=N-2; i>=0; i-=2) cgi.hpcpush(hpxy(ship[i] - .03, -ship[i+1]));
+  cgi.hpcpush(hpxy(ship[0] - .03, ship[1]));
+  cgi.finishshape();
+  cgi.extra_vertices();
+  }
+
+}}