diff --git a/src/components/InteractiveObjects/MazeQuizGame/MazeObject.js b/src/components/InteractiveObjects/MazeQuizGame/MazeObject.js
index 5d5270a..795a5a8 100644
--- a/src/components/InteractiveObjects/MazeQuizGame/MazeObject.js
+++ b/src/components/InteractiveObjects/MazeQuizGame/MazeObject.js
@@ -1,5 +1,6 @@
 import { Group, Vector3, Matrix4, Mesh, Quaternion, PlaneGeometry, MeshStandardMaterial, DoubleSide, RepeatWrapping, Vector2} from 'three';
 import { InteractiveObject } from '../InteractiveObject';
+import { getBoundingBox, getBoundingBoxSize } from '@/lib/MeshUtils';
 
 class MazeObject {
     constructor(engine, def, params){
@@ -103,8 +104,9 @@ class MazeObject {
                 root.add(t);
             }
             offsetZ = def.len * tubeSize;
-            addPhysics(def.matrix, [tubeSize / 2, 0.6, offsetZ/2], offsetZ)
-            addPhysics(def.matrix, [-tubeSize / 2, 0.6, offsetZ/2], offsetZ)
+            let sz = { width: Math.max(0.1, (tubeSize-o.tunnel.userData.size.x)/2), height:1, depth:offsetZ/2 }
+            addPhysics(def.matrix, [tubeSize / 2, 0.6, offsetZ/2], sz)
+            addPhysics(def.matrix, [-tubeSize / 2, 0.6, offsetZ/2], sz)
             //the floor:
             addPhysics(def.matrix, [0, -0.1, offsetZ/2], {width:tubeSize/2, height:0.1, depth: offsetZ/2})
 
@@ -146,29 +148,31 @@ class MazeObject {
             let mazeAsset = await engine.load(params.mazeFile, '/static/meshes/quiz/');
             ['tunnel', 'wall', 'door', 'floor', 'surface'].forEach(e => {
                 o[e] = mazeAsset.scene.getObjectByName(e);
-                //o[e].frustumCulled = false;
-                o[e].scale.set(scale, scale, scale)
+                if (o[e]){
+                    o[e].scale.setScalar(scale);
+                    let bb = getBoundingBox(o[e]);
+                    o[e].userData.size = getBoundingBoxSize(bb);
+                }
             });
             this.mazeObject(def, room);
 
-            let floorSize = { width: bbox.r - bbox.l + 10*scale, height: 1, depth: bbox.f + 10*scale }
-            const floor = o.surface.clone();
-            const mt = floor.material.clone();
-            ['map', 'normalMap'].forEach(m=>{
-                if (!mt[m]) return //console.log('missing', m);
-                mt[m] = mt[m].clone();
-                mt[m].wrapS = mt[m].wrapT = RepeatWrapping;
-                mt[m].repeat = new Vector2(Math.floor(floorSize.width/wallSize), Math.floor(floorSize.depth/wallSize));
-                mt[m].needsUpdate = true;
-            });
-            mt.needsUpdate = true;
-            floor.material = mt;
-            floor.position.set((bbox.l + bbox.r)/2, 0, bbox.f/2);
-            floor.scale.set(floorSize.width, scale, floorSize.depth)
-            root.add(floor);
-            //let pf = engine.physics.add({position: floor.position}, 'fixed', false, undefined, 'cuboid', floorSize)
-            //pf.collider.setRestitution(0);
-            //pf.collider.setTranslationWrtParent({x:0, y: -floorSize.height, z:0})
+            if (o.surface){
+                let floorSize = { width: bbox.r - bbox.l + 10*scale, height: 1, depth: bbox.f + 10*scale }
+                const floor = o.surface.clone();
+                const mt = floor.material.clone();
+                ['map', 'normalMap'].forEach(m=>{
+                    if (!mt[m]) return //console.log('missing', m);
+                    mt[m] = mt[m].clone();
+                    mt[m].wrapS = mt[m].wrapT = RepeatWrapping;
+                    mt[m].repeat = new Vector2(Math.floor(floorSize.width/wallSize), Math.floor(floorSize.depth/wallSize));
+                    mt[m].needsUpdate = true;
+                });
+                mt.needsUpdate = true;
+                floor.material = mt;
+                floor.position.set((bbox.l + bbox.r)/2, 0, bbox.f/2);
+                floor.scale.set(floorSize.width, scale, floorSize.depth)
+                root.add(floor);
+            }
         }
     }
 }