diff --git a/include/surface_terrains.h b/include/surface_terrains.h
index 908a73eb..155ed250 100644
--- a/include/surface_terrains.h
+++ b/include/surface_terrains.h
@@ -13,7 +13,7 @@ enum SurfaceTypes {
     SURFACE_0004,                       // 0x0004 // Unused, has no function and has parameters
     SURFACE_HANGABLE,                   // 0x0005 // Ceiling that Mario can climb on
     SURFACE_0006,                       // 0x0006 // Unused
-    SURFACE_0007,                       // 0x0007 // Unused
+    SURFACE_SUPER_SLIPPERY,             // 0x0007 // Super slippery surface, good for delimiting your level
     SURFACE_0008,                       // 0x0008 // Unused
     SURFACE_SLOW,                       // 0x0009 // Slow down Mario, unused
     SURFACE_DEATH_PLANE,                // 0x000A // Death floor. Warps to ID of force parameter's second byte if set, otherwise warps to 0xF3 if it exists, otherwise defaults to ID 0xF1.
diff --git a/src/game/mario.c b/src/game/mario.c
index fcf9eafb..c3e743f1 100644
--- a/src/game/mario.c
+++ b/src/game/mario.c
@@ -404,6 +404,7 @@ s32 mario_get_floor_class(struct MarioState *m) {
                 floorClass = SURFACE_CLASS_SLIPPERY;
                 break;
 
+            case SURFACE_SUPER_SLIPPERY:
             case SURFACE_VERY_SLIPPERY:
             case SURFACE_ICE:
             case SURFACE_HARD_VERY_SLIPPERY:
@@ -482,6 +483,7 @@ u32 mario_get_terrain_sound_addend(struct MarioState *m) {
                     floorSoundType = 2;
                     break;
 
+                case SURFACE_SUPER_SLIPPERY:
                 case SURFACE_VERY_SLIPPERY:
                 case SURFACE_ICE:
                 case SURFACE_HARD_VERY_SLIPPERY:
@@ -512,6 +514,10 @@ u32 mario_get_terrain_sound_addend(struct MarioState *m) {
  * Determines if Mario is facing "downhill."
  */
 s32 mario_facing_downhill(struct MarioState *m, s32 turnYaw) {
+    // Forces Mario to do a belly slide rather than a butt slide when on a super slippery floor, no matter his angle, so that the player can't jump.
+    if (m->floor && m->floor->type == SURFACE_SUPER_SLIPPERY)
+        return FALSE;
+
     s16 faceAngleYaw = m->faceAngle[1];
 
     // This is never used in practice, as turnYaw is
@@ -531,7 +537,7 @@ s32 mario_facing_downhill(struct MarioState *m, s32 turnYaw) {
 u32 mario_floor_is_slippery(struct MarioState *m) {
     f32 normY;
 
-    if ((m->area->terrainType & TERRAIN_MASK) == TERRAIN_SLIDE  && m->floor->normal.y < COS1) {
+    if (((m->area->terrainType & TERRAIN_MASK) == TERRAIN_SLIDE  && m->floor->normal.y < COS1) || (m->floor->type == SURFACE_SUPER_SLIPPERY)) {
         return TRUE;
     }
 
@@ -551,8 +557,8 @@ u32 mario_floor_is_slippery(struct MarioState *m) {
 s32 mario_floor_is_slope(struct MarioState *m) {
     f32 normY;
 
-    if ((m->area->terrainType & TERRAIN_MASK) == TERRAIN_SLIDE
-        && m->floor->normal.y < COS1) {
+    if (((m->area->terrainType & TERRAIN_MASK) == TERRAIN_SLIDE
+        && m->floor->normal.y < COS1) || (m->floor->type == SURFACE_SUPER_SLIPPERY)) {
         return TRUE;
     }
 
@@ -571,6 +577,8 @@ s32 mario_floor_is_slope(struct MarioState *m) {
  */
 s32 mario_floor_is_steep(struct MarioState *m) {
     f32 normY;
+    if (m->floor->type == SURFACE_SUPER_SLIPPERY)
+        return TRUE;
 
 #ifdef JUMP_KICK_FIX
     if (m->floor->type == SURFACE_NOT_SLIPPERY) {
diff --git a/src/game/mario_actions_moving.c b/src/game/mario_actions_moving.c
index 23dc7a87..902a1823 100644
--- a/src/game/mario_actions_moving.c
+++ b/src/game/mario_actions_moving.c
@@ -470,10 +470,11 @@ void update_walking_speed(struct MarioState *m) {
 
 s32 should_begin_sliding(struct MarioState *m) {
     if (m->input & INPUT_ABOVE_SLIDE) {
+        s32 superSlippery = (m->floor != NULL) && (m->floor->type == SURFACE_SUPER_SLIPPERY);
         s32 slideLevel = (m->area->terrainType & TERRAIN_MASK) == TERRAIN_SLIDE;
         s32 movingBackward = m->forwardVel <= -1.0f;
 
-        if (slideLevel || movingBackward || mario_facing_downhill(m, FALSE)) {
+        if (superSlippery || slideLevel || movingBackward || mario_facing_downhill(m, FALSE)) {
             return TRUE;
         }
     }