diff --git a/TODO.txt b/TODO.txt
index f11b359..0f2dbb9 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -1,7 +1,6 @@
 =========== GENERAL ==============
 
 - replay validation
-- add time slow down setting
 - add argc/argv to gameInit? could be used to quickly start maps, verify
   replays etc.
 - maybe each map could have a target time embedded: when beaten, the map would
@@ -26,6 +25,7 @@
 =========== HANDLED ==============
 
 - allow stopping car rotation in air like in Trackmania
+- add time slow down setting
 - the horizon on background seems too low? maybe add setting to shift it a bit?
 - replay format
 - prevent time overflow! stop incrementing level frame once it's at maximum
diff --git a/game.h b/game.h
index 2cc9661..e52ff80 100644
--- a/game.h
+++ b/game.h
@@ -286,8 +286,8 @@ void LCR_gameSetState(uint8_t state)
 LCR_GameUnit LCR_carSpeedKMH(void)
 {
   return // we use 28/8 as an approximation of 3.6 to convers MPS to KMH
-    (28 * LCR_SETTING_METERS_PER_BLOCK * LCR_racingGetCarSpeedUnsigned() *
-    LCR_RACING_FPS) / (8 * LCR_GAME_UNIT);
+    (28 * LCR_SETTING_CMS_PER_BLOCK * LCR_racingGetCarSpeedUnsigned() *
+    LCR_RACING_FPS) / (800 * LCR_GAME_UNIT);
 }
 
 void LCR_gameResetRun(uint8_t replay)
diff --git a/general.h b/general.h
index cf3987e..e1173e1 100644
--- a/general.h
+++ b/general.h
@@ -8,6 +8,8 @@
 #include <stdint.h>
 #include "settings.h"
 
+// TODO: maybe move module specific constants to the modules themselves?
+
 // constants (not supposed to be changed, doing so may break stuff):
 
 #define LCR_EFFECTIVE_RESOLUTION_X \
@@ -31,7 +33,8 @@
 /** Physics FPS, i.e. the number of physics ticks per second. */
 #define LCR_RACING_FPS 30
 
-#define LCR_RACING_TICK_MS (1000 / LCR_RACING_FPS)
+#define LCR_RACING_TICK_MS \
+  (100000 / (LCR_RACING_FPS * LCR_SETTING_TIME_MULTIPLIER))
 
 #define LCR_ANIMATE_CAR (LCR_SETTING_CAR_ANIMATION_SUBDIVIDE != 0)
 
diff --git a/renderer.h b/renderer.h
index ada0c84..2a1f0d0 100644
--- a/renderer.h
+++ b/renderer.h
@@ -1313,7 +1313,7 @@ void LCR_rendererDrawSky(int sky, S3L_Unit offsetH, S3L_Unit offsetV)
 
   anchorPoint[1] = 
     (LCR_EFFECTIVE_RESOLUTION_Y) / 2 - // 3: we place the center a bit more up
-    (LCR_SETTING_HORIZON_SHIFT * LCR_EFFECTIVE_RESOLUTION_Y) / 16 -
+    (LCR_SETTING_HORIZON_SHIFT * LCR_EFFECTIVE_RESOLUTION_Y) / 100 -
     (LCR_EFFECTIVE_RESOLUTION_Y * offsetV) / S3L_F
     - LCR_IMAGE_SIZE * LCR_SETTING_SKY_SIZE;
   
diff --git a/settings.h b/settings.h
index 35fabde..4634619 100644
--- a/settings.h
+++ b/settings.h
@@ -88,17 +88,6 @@
   #define LCR_SETTING_LOD_COLOR 0x4229
 #endif
 
-#ifndef LCR_SETTING_FLOOR_PARTICLE_RESOLUTION
-  /** How many level floor particles there will be along one principal axis, 0
-    turns floor particles off. */
-  #define LCR_SETTING_FLOOR_PARTICLE_RESOLUTION 6
-#endif
-
-#ifndef LCR_SETTING_FLOOR_PARTICLE_SIZE
-  /** Defines floor particle size in fractions of screen size. */
-  #define LCR_SETTING_FLOOR_PARTICLE_SIZE 32
-#endif
-
 #ifndef LCR_SETTING_CAR_ANIMATION_SUBDIVIDE
   /** How many frames will be used to complete whole animation of the car model.
     0 turns off car animation completely (may be faster and smaller), 1 turns on
@@ -160,10 +149,10 @@
   #define LCR_SETTING_LOG_LEVEL 1
 #endif
 
-#ifndef LCR_SETTING_METERS_PER_BLOCK
-  /** How many meters one game block is considered to measure (horizontally).
-    This is for calculating speed etc. */
-  #define LCR_SETTING_METERS_PER_BLOCK 4
+#ifndef LCR_SETTING_CMS_PER_BLOCK
+  /** How many centimeters one game block is considered to measure
+    (horizontally). This is for calculating speed etc. */
+  #define LCR_SETTING_CMS_PER_BLOCK 400
 #endif
 
 #ifndef LCR_SETTING_DEBUG_PHYSICS_DRAW
@@ -205,8 +194,13 @@
 #endif
 
 #ifndef LCR_SETTING_HORIZON_SHIFT
-  /** Vertical offset of the background horizon, 1/16th of screen height. */
-  #define LCR_SETTING_HORIZON_SHIFT 5
+  /** Vertical offset of the background horizon in percents of screen height. */
+  #define LCR_SETTING_HORIZON_SHIFT 30
+#endif
+
+#ifndef LCR_SETTING_TIME_MULTIPLIER
+  /** Multiplies speed of time by this percentage, doesn't affect physics. */
+  #define LCR_SETTING_TIME_MULTIPLIER 100
 #endif
 
 #endif // guard