diff --git a/js/editor/editordefs.js b/js/editor/editordefs.js
index 36622fd..1d6e7fa 100644
--- a/js/editor/editordefs.js
+++ b/js/editor/editordefs.js
@@ -924,7 +924,7 @@ export const TILE_DESCRIPTIONS = {
     },
     sand: {
         name: "Sand",
-        desc: "Anything walking on it moves at half speed.  Stops all blocks.",
+        desc: "Anything walking on it moves 50% slower.  Stops all blocks.",
     },
     grass: {
         name: "Grass",
diff --git a/js/game.js b/js/game.js
index 4332c46..2b734f1 100644
--- a/js/game.js
+++ b/js/game.js
@@ -1158,7 +1158,9 @@ export class Level extends LevelInterface {
                 else if (terrain.type.name === 'popdown_floor') {
                     this.sfx.play_once('step-popdown');
                 }
-                else if (terrain.type.name === 'gravel' || terrain.type.name === 'railroad') {
+                else if (terrain.type.name === 'gravel' || terrain.type.name === 'railroad' ||
+                    terrain.type.name === 'sand' || terrain.type.name === 'grass')
+                {
                     this.sfx.play_once('step-gravel');
                 }
                 else if (terrain.type.name === 'water') {
@@ -1907,7 +1909,7 @@ export class Level extends LevelInterface {
         let terrain = goal_cell.get_terrain();
         let ignore = actor.ignores(terrain.type.name) || actor.slide_ignores(terrain.type.name);
         if (terrain.type.speed_factor && ! ignore) {
-            speed /= terrain.type.speed_factor;
+            speed *= terrain.type.speed_factor;
         }
         // Speed boots speed us up, UNLESS we're entering a terrain with a speed factor and an
         // unignored slide mode -- so e.g. we gain 2x on teleports, ice + ice skates, force floors +
diff --git a/js/tiletypes.js b/js/tiletypes.js
index 367525e..70d4ef7 100644
--- a/js/tiletypes.js
+++ b/js/tiletypes.js
@@ -56,7 +56,7 @@ function _define_force_floor(direction, opposite_type) {
     return {
         layer: LAYERS.terrain,
         slide_mode: 'force',
-        speed_factor: 2,
+        speed_factor: 0.5,
         allow_player_override: true,
         // Used by Lynx to prevent backwards overriding
         force_floor_direction: direction,
@@ -729,7 +729,7 @@ const TILE_TYPES = {
     sand: {
         layer: LAYERS.terrain,
         blocks_collision: COLLISION.block_cc1 | COLLISION.block_cc2,
-        speed_factor: 0.5,
+        speed_factor: 1.5,
     },
     grass: {
         // TODO should bugs leave if they have no other option...?  that seems real hard.
@@ -759,7 +759,7 @@ const TILE_TYPES = {
     },
     dash_floor: {
         layer: LAYERS.terrain,
-        speed_factor: 2,
+        speed_factor: 0.5,
     },
     spikes: {
         layer: LAYERS.terrain,
@@ -919,7 +919,7 @@ const TILE_TYPES = {
     cracked_ice: {
         layer: LAYERS.terrain,
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         on_arrive(me, level, other) {
             level.schedule_actor_slide(other);
         },
@@ -932,7 +932,7 @@ const TILE_TYPES = {
     ice: {
         layer: LAYERS.terrain,
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         on_arrive(me, level, other) {
             level.schedule_actor_slide(other);
         },
@@ -941,7 +941,7 @@ const TILE_TYPES = {
         layer: LAYERS.terrain,
         thin_walls: new Set(['south', 'west']),
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         blocks_leaving: blocks_leaving_thin_walls,
         on_arrive(me, level, other) {
             let direction = {
@@ -957,7 +957,7 @@ const TILE_TYPES = {
         layer: LAYERS.terrain,
         thin_walls: new Set(['north', 'west']),
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         blocks_leaving: blocks_leaving_thin_walls,
         on_arrive(me, level, other) {
             let direction = {
@@ -973,7 +973,7 @@ const TILE_TYPES = {
         layer: LAYERS.terrain,
         thin_walls: new Set(['north', 'east']),
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         blocks_leaving: blocks_leaving_thin_walls,
         on_arrive(me, level, other) {
             let direction = {
@@ -989,7 +989,7 @@ const TILE_TYPES = {
         layer: LAYERS.terrain,
         thin_walls: new Set(['south', 'east']),
         slide_mode: 'ice',
-        speed_factor: 2,
+        speed_factor: 0.5,
         blocks_leaving: blocks_leaving_thin_walls,
         on_arrive(me, level, other) {
             let direction = {
@@ -1008,7 +1008,7 @@ const TILE_TYPES = {
     force_floor_all: {
         layer: LAYERS.terrain,
         slide_mode: 'force',
-        speed_factor: 2,
+        speed_factor: 0.5,
         allow_player_override: true,
         blocks(me, level, other) {
             return (level.compat.rff_blocks_monsters &&