diff --git a/putt/game.c b/putt/game.c
index 654489503..4c559a508 100644
--- a/putt/game.c
+++ b/putt/game.c
@@ -57,6 +57,8 @@ static float jump_p[3];                 /* Jump destination                  */
 
 static float idle_t;                    /* Idling timeout                    */
 
+static int   fast_timescale;            /* Whether fast-timescale mode is on */
+
 /*---------------------------------------------------------------------------*/
 
 static void view_init(void)
@@ -509,6 +511,15 @@ int game_step(const float g[3], float dt)
     if (!state)
         return GAME_NONE;
 
+    if (config_cheat())
+    {
+        if (fast_timescale)
+        {
+            /* Apply timescale when shift is pressed down. */
+            dt *= 3.0f;
+        }
+    }
+
     s = (7.f * s + dt) / 8.f;
     t = s;
 
@@ -708,5 +719,17 @@ void game_set_pos(float p[3], float e[3][3])
     v_cpy(file.vary.uv[ball].e[2], e[2]);
 }
 
+void game_set_fast(int d)
+{
+    if (!config_cheat())
+    {
+        fast_timescale = 0;
+    }
+    else
+    {
+        fast_timescale = d;
+    }
+}
+
 /*---------------------------------------------------------------------------*/
 
diff --git a/putt/game.h b/putt/game.h
index 0dfb62f69..cf2a0c7d5 100644
--- a/putt/game.h
+++ b/putt/game.h
@@ -52,6 +52,8 @@ void  game_ball(int);
 void  game_set_pos(float[3], float[3][3]);
 void  game_get_pos(float[3], float[3][3]);
 
+void  game_set_fast(int);
+
 /*---------------------------------------------------------------------------*/
 
 #endif
diff --git a/putt/st_all.c b/putt/st_all.c
index c6538532b..27041c283 100644
--- a/putt/st_all.c
+++ b/putt/st_all.c
@@ -696,6 +696,12 @@ static int pause_click(int b, int d)
 
 static int pause_keybd(int c, int d)
 {
+    if (config_tst_d(CONFIG_KEY_ROTATE_FAST, c))
+    {
+        game_set_fast(d);
+        return 1;
+    }
+
     if (d && c == KEY_EXIT)
         return pause_action(PAUSE_CONTINUE);
     return 1;
@@ -718,6 +724,12 @@ static int pause_buttn(int b, int d)
 
 static int shared_keybd(int c, int d)
 {
+    if (config_tst_d(CONFIG_KEY_ROTATE_FAST, c))
+    {
+        game_set_fast(d);
+        return 1;
+    }
+
     if (d)
     {
         if (c == KEY_EXIT)
@@ -810,6 +822,12 @@ static int next_click(int b, int d)
 
 static int next_keybd(int c, int d)
 {
+    if (config_tst_d(CONFIG_KEY_ROTATE_FAST, c))
+    {
+        game_set_fast(d);
+        return 1;
+    }
+
     if (d)
     {
         if (c == KEY_POSE)