diff --git a/engine/source/game/marble/marble.cpp b/engine/source/game/marble/marble.cpp
index a02db4d2..c4b1e694 100644
--- a/engine/source/game/marble/marble.cpp
+++ b/engine/source/game/marble/marble.cpp
@@ -2274,8 +2274,11 @@ ConsoleMethod(Marble, setPhysics, void, 3, 3, "(physics)")
     physicsStrings[Marble::XNA] = "XNA";
     physicsFlags[Marble::XNA] = Marble::XNA;
 
-    physicsStrings[Marble::XNASlopes] = "XNASlopes";
-    physicsFlags[Marble::XNASlopes] = Marble::XNASlopes;
+    physicsStrings[Marble::MBUSlopes] = "MBUSlopes";
+    physicsFlags[Marble::MBUSlopes] = Marble::MBUSlopes;
+
+    physicsStrings[Marble::MBGSlopes] = "MBGSlopes";
+    physicsFlags[Marble::MBGSlopes] = Marble::MBGSlopes;
 
     S32 i = 0;
     while (dStricmp(physicsStrings[i], physics))
diff --git a/engine/source/game/marble/marble.h b/engine/source/game/marble/marble.h
index 9324b672..63707886 100644
--- a/engine/source/game/marble/marble.h
+++ b/engine/source/game/marble/marble.h
@@ -71,7 +71,8 @@ class Marble : public ShapeBase
         MBU,
         MBG,
         XNA,
-        XNASlopes,
+        MBUSlopes,
+        MBGSlopes,
         MBPhysics_Count
     };
 
diff --git a/engine/source/game/marble/marblecollision.cpp b/engine/source/game/marble/marblecollision.cpp
index 37982107..c75d317d 100644
--- a/engine/source/game/marble/marblecollision.cpp
+++ b/engine/source/game/marble/marblecollision.cpp
@@ -592,19 +592,19 @@ void Marble::findContacts(U32 contactMask, const Point3D* inPos, const F32* inRa
 
 						if (PlaneD(vertPlane + vertex, vertex, vertex + plane).distToPlane(contactVert) >= 0.0) {
 							if (PlaneD(lastVertex - vertPlane, lastVertex, lastVertex + plane).distToPlane(contactVert) >= 0.0) {
-                                if (mPhysics == MBG)
+                                if (mPhysics == MBG || mPhysics == MBGSlopes)
                                     finalContact = vertPlane.project(contactVert);
                                 else
 								    contactVert = vertPlane.project(contactVert);
 								break;
 							}
-                            if (mPhysics == MBG)
+                            if (mPhysics == MBG || mPhysics == MBGSlopes)
                                 finalContact = lastVertex;
                             else
 							    contactVert = lastVertex;
 						}
 						else {
-                            if (mPhysics == MBG)
+                            if (mPhysics == MBG || mPhysics == MBGSlopes)
 							    finalContact = vertex;
                             else
                                 contactVert = vertex;
@@ -628,7 +628,7 @@ void Marble::findContacts(U32 contactMask, const Point3D* inPos, const F32* inRa
 
 			U32 materialId = poly->material;
             Point3D delta;
-            if (mPhysics == MBG)
+            if (mPhysics == MBG || mPhysics == MBGSlopes)
                 delta = *pos - finalContact;
             else
 			    delta = *pos - contactVert;
@@ -655,7 +655,7 @@ void Marble::findContacts(U32 contactMask, const Point3D* inPos, const F32* inRa
 
 			contact.restitution = restitution;
 			contact.normal = normal;
-            if (mPhysics == MBG)
+            if (mPhysics == MBG || mPhysics == MBGSlopes)
                 contact.position = finalContact;
             else
 			    contact.position = contactVert;
diff --git a/engine/source/game/marble/marblephysics.cpp b/engine/source/game/marble/marblephysics.cpp
index c0eefafd..0889e3d7 100644
--- a/engine/source/game/marble/marblephysics.cpp
+++ b/engine/source/game/marble/marblephysics.cpp
@@ -106,7 +106,7 @@ void Marble::applyContactForces(const Move* move, bool isCentered, Point3D& aCon
         }
     }
 
-    if (mPhysics != XNASlopes)
+    if (mPhysics != MBUSlopes && mPhysics != MBGSlopes)
     {
         for (S32 i = 0; i < mContacts.size(); i++)
         {
@@ -265,7 +265,7 @@ bool Marble::computeMoveForces(Point3D& aControl, Point3D& desiredOmega, const M
     Point2F currentVelocity(mDot(sideDir, rollVelocity), mDot(motionDir, rollVelocity));
 
     Point2F mv(move->x, move->y);
-    if (mPhysics != MBG)
+    if (mPhysics != MBG && mPhysics != MBGSlopes)
     {
         // Prevent increasing marble speed with diagonal movement (on the ground)
         mv *= 1.538461565971375;
@@ -677,7 +677,7 @@ void Marble::advancePhysics(const Move* move, U32 timeDelta)
         }
 
         it++;
-    } while (mPhysics == MBG || it <= 10);
+    } while (mPhysics == MBG || mPhysics == MBGSlopes || it <= 10);
 
     for (S32 i = 0; i < smPathItrVec.size(); i++)
         smPathItrVec[i]->popTickState();
diff --git a/game/marble/data/missions/Multiplayer/Polysoup/polysoup.mis b/game/marble/data/missions/Multiplayer/Polysoup/polysoup.mis
index 54745431..c9dd94e1 100644
--- a/game/marble/data/missions/Multiplayer/Polysoup/polysoup.mis
+++ b/game/marble/data/missions/Multiplayer/Polysoup/polysoup.mis
@@ -11,7 +11,7 @@ name = $Text::LevelNameMP26;
          difficulty = "4";
          gameType = "MultiPlayer";
          gameMode = "Scrum";
-         physics = "XNASlopes";
+         physics = "MBUSlopes";
          time = "300000";
          maxGemsPerGroup = "9";
          desc = "A preview mission";