diff --git a/rogueviz/ads/ds-game.cpp b/rogueviz/ads/ds-game.cpp
index 85f045a6..f9b9277d 100644
--- a/rogueviz/ads/ds-game.cpp
+++ b/rogueviz/ads/ds-game.cpp
@@ -17,6 +17,8 @@ void set_default_keys();
 
 vector<unique_ptr<ads_object>> rocks;
 
+bool disable_ds_gen;
+
 struct rock_generator {
   ld cshift;
 
@@ -190,10 +192,12 @@ struct rock_generator {
     }
 
   void add_until(ld t) {
+    if(disable_ds_gen) return;
     while(cshift < t) add_random();
     }
 
   void add_rsrc_until(ld t) {
+    if(disable_ds_gen) return;
     while(cshift < t) {
       ld rapidity = rand_range(0, 3);
       ld step = rand_range(.2, .5);
diff --git a/rogueviz/ads/tour.cpp b/rogueviz/ads/tour.cpp
index 203af368..c3f12b2d 100644
--- a/rogueviz/ads/tour.cpp
+++ b/rogueviz/ads/tour.cpp
@@ -126,6 +126,8 @@ slide relhell_tour[] = {
     "Such effects can be also observed in this slide, although you still need to wait for a long time or move very fast. They will be more pronounced in Relative Hell, and in the later slides.",
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        add_ds_cleanup();
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
         ads_game::run_ds_game_std();
         const ld sca = 100;
         tour::slide_backup(ds_simspeed, M_PI / 10 / sca * 5);
@@ -149,10 +151,6 @@ slide relhell_tour[] = {
 
         rockgen.cshift = 10;
         });
-      if(mode == pmStart) {
-        add_ds_cleanup();
-        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
-        }
       }
     },
 
@@ -164,6 +162,8 @@ slide relhell_tour[] = {
     "the previous slide.",
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
+        add_ds_cleanup();
         ads_game::run_ds_game_std();
         const ld sca = 100;
         tour::slide_backup(ds_simspeed, M_PI / 10 / sca * 5);
@@ -194,10 +194,6 @@ slide relhell_tour[] = {
 
         rockgen.cshift = 10;
         });
-      if(mode == pmStart) {
-        add_ds_cleanup();
-        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
-        }
       }
     },
 
@@ -206,6 +202,8 @@ slide relhell_tour[] = {
     "Try to accelerate, then return to the yellow star. Your clock will be different than the clock of the star.",
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
+        add_ds_cleanup();
         ads_game::run_ds_game_std();
         const ld sca = 100;
         tour::slide_backup(ds_simspeed, M_PI / 10 / sca * 5);
@@ -215,16 +213,14 @@ slide relhell_tour[] = {
         tour::slide_backup(pconf.scale, sca);
         tour::slide_backup(texture_off, true);
         tour::slide_backup(view_proper_times, true);
+        tour::slide_backup(time_scale, 0.15);
+        tour::slide_backup(disable_ds_gen, true);
         dynamicval<ld> fs(future_shown, -10);
         ds_restart_scaled();
         tour::slide_backup(invincibility_pt, HUGE_VAL);
 
         rockgen.cshift = 10;
         });
-      if(mode == pmStart) {
-        add_ds_cleanup();
-        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
-        }
       }
     },
 
@@ -317,12 +313,10 @@ slide relhell_tour[] = {
 
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
-        ads_game::run_ds_game_std();
-        });
-      if(mode == pmStart) {
         add_ds_cleanup();
         rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
-        }
+        ads_game::run_ds_game_std();
+        });
       }
     },
 
@@ -385,6 +379,7 @@ slide relhell_tour[] = {
 
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
         ads_game::run_ads_game_std();
         /* disable everything */
         tour::slide_backup(pconf.alpha, 1);
@@ -433,6 +428,7 @@ slide relhell_tour[] = {
 
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
         ads_game::run_ads_game_std();
         /* disable everything */
         tour::slide_backup(pconf.alpha, 0);
@@ -462,6 +458,7 @@ slide relhell_tour[] = {
 
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
         ads_game::run_ads_game_std();
         tour::slide_backup(pconf.alpha, 1);
         rv_hook(hooks_pre_ads_start, 100, [] {
@@ -483,6 +480,7 @@ slide relhell_tour[] = {
 
     [] (presmode mode) {
       setCanvas(mode, &ccolor::plain, [] {
+        rogueviz::on_cleanup_or_next([] { lps_enable(nullptr); });
         ads_game::run_ads_game_std();
        });
       }