diff --git a/source/engine/2dphysics.c b/source/engine/2dphysics.c
index 55d17f4..4c5730a 100644
--- a/source/engine/2dphysics.c
+++ b/source/engine/2dphysics.c
@@ -608,20 +608,23 @@ void register_collide(void *sym) {
 
 }
 
-void duk_call_phys_cb(cpArbiter *arb, struct callee c, int hit)
+void duk_call_phys_cb(cpVect norm, struct callee c, int hit)
 {
     duk_push_heapptr(duk, c.fn);
     duk_push_heapptr(duk, c.obj);
 
     int obj = duk_push_object(duk);
 
-    vect2duk(cpArbiterGetNormal(arb));
+    vect2duk(norm);
     duk_put_prop_literal(duk, obj, "normal");
 
     duk_push_int(duk, hit);
     duk_put_prop_literal(duk, obj, "hit");
 
-    duk_call_method(duk, 1);
+    duk_call_method(duk,1);
+
+//    if (duk_pcall_method(duk, 1))
+//      duk_run_err();
     duk_pop(duk);
 }
 
@@ -639,13 +642,27 @@ static cpBool script_phys_cb_begin(cpArbiter *arb, cpSpace *space, void *data)
     int g1 = cpBodyGetUserData(body1);
     int g2 = cpBodyGetUserData(body2);
     struct gameobject *go = id2go(g1);
+    struct gameobject *go2 = id2go(g2);
 
-    for (int i = 0; i < arrlen(go->shape_cbs); i++) {
-      duk_call_phys_cb(arb, go->shape_cbs[i].cbs.begin, g2);
-    }
-    
+    cpVect norm1 = cpArbiterGetNormal(arb);
+
+    for (int i = 0; i < arrlen(go->shape_cbs); i++)
+      duk_call_phys_cb(norm1, go->shape_cbs[i].cbs.begin, g2);
+     
     if (go->cbs.begin.obj)
-      duk_call_phys_cb(arb, go->cbs.begin, g2);
+      duk_call_phys_cb(norm1, go->cbs.begin, g2);
+
+    return;
+
+    cpVect norm2 = norm1;
+    norm2.x *= -1;
+    norm2.y *= -1;
+
+    for (int i = 0; i < arrlen(go2->shape_cbs); i++)
+      duk_call_phys_cb(norm2, go2->shape_cbs[i].cbs.begin, g1);
+    
+    if (go2->cbs.begin.obj)
+      duk_call_phys_cb(norm2, go2->cbs.begin, g1);
 
     return 1;
 }
diff --git a/source/engine/engine.c b/source/engine/engine.c
index ddda47e..d3a2a33 100644
--- a/source/engine/engine.c
+++ b/source/engine/engine.c
@@ -63,5 +63,5 @@ void engine_init()
     phys2d_init();
 
     YughInfo("Starting sound ...");
-    //sound_init();
+    sound_init();
 }
diff --git a/source/engine/ffi.c b/source/engine/ffi.c
index 2faa721..dc1e7bb 100644
--- a/source/engine/ffi.c
+++ b/source/engine/ffi.c
@@ -792,6 +792,10 @@ duk_ret_t duk_register(duk_context *duk) {
        unregister_obj(obj);
        break;
 
+     case 5:
+       unregister_gui(c);
+       break;
+
      }
 
    return 0;
@@ -845,7 +849,7 @@ duk_ret_t duk_sys_cmd(duk_context *duk) {
             sim_stop();
             break;
 
-        case 3:
+       case 3:
             sim_pause();
             break;
 
diff --git a/source/engine/gameobject.c b/source/engine/gameobject.c
index cff9647..696260c 100644
--- a/source/engine/gameobject.c
+++ b/source/engine/gameobject.c
@@ -187,24 +187,44 @@ void rm_body_shapes(cpBody *body, cpShape *shape, void *data) {
     cpShapeFree(shape);
 }
 
-/* Really more of a "mark for deletion" ... */
-void gameobject_delete(int id)
-{
-    id2go(id)->next = first;
-    first = id;
-}
+int *go_toclean = NULL;
 
 /* Free this gameobject */
 void gameobject_clean(int id) {
     struct gameobject *go = id2go(id);
+    arrfree(go->shape_cbs);
     cpBodyEachShape(go->body, rm_body_shapes, NULL);
     cpSpaceRemoveBody(space, go->body);
     cpBodyFree(go->body);
     go->body = NULL;
 }
 
+/* Really more of a "mark for deletion" ... */
+void gameobject_delete(int id)
+{
+    id2go(id)->next = first;
+    first = id;
+
+    if (cpSpaceIsLocked(space)) {
+      YughInfo("Space is simulating; adding %d to queue ...", id);
+      arrpush(go_toclean, id);
+    }
+    else
+      gameobject_clean(id);
+}
+
 void gameobjects_cleanup() {
+    for (int i = 0; i < arrlen(go_toclean); i++) {
+      YughInfo("Cleaning object %d", go_toclean[i]);
+      gameobject_clean(go_toclean[i]);
+    }
+
+    arrsetlen(go_toclean, 0);
+    
+    return;
+
     int clean = first;
+    YughInfo("Initiating a clean");
 
     while (clean >= 0 && id2go(clean)->body) {
         gameobject_clean(clean);
@@ -212,71 +232,6 @@ void gameobjects_cleanup() {
     }
 }
 
-void gameobject_save(struct gameobject *go, FILE * file)
-{
-/*
-    fwrite(go, sizeof(*go), 1, file);
-
-    YughInfo("Number of components is %d.", arrlen(go->components));
-
-    int n = arrlen(go->components);
-    fwrite(&n, sizeof(n), 1, file);
-    for (int i = 0; i < n; i++) {
-        fwrite(&go->components[i].id, sizeof(int), 1, file);
-
-        if (go->components[i].io == NULL)
-            fwrite(go->components[i].data, go->components[i].datasize, 1, file);
-        else
-            go->components[i].io(go->components[i].data, file, 0);
-    }
-    */
-}
-
-void gameobject_init(struct gameobject *go, FILE * fprefab)
-{
-/*
-    go->body = cpSpaceAddBody(space, cpBodyNew(go->mass, 1.f));
-    cpBodySetType(go->body, go->bodytype);
-    cpBodySetUserData(go->body, go);
-
-
-
-    int comp_n;
-    fread(&comp_n, sizeof(int), 1, fprefab);
-    arrfree(go->components);
-    int n;
-
-    for (int i = 0; i < comp_n; i++) {
-        fread(&n, sizeof(int), 1, fprefab);
-        arrput(go->components, components[n]);
-        struct component *newc = &arrlast(go->components);
-        newc->go = go;
-        newc->data = newc->make(newc->go);
-
-        if (newc->io == NULL)
-            fread(newc->data, newc->datasize, 1, fprefab);
-        else
-            newc->io(newc->data, fprefab, 1);
-
-        newc->init(newc->data, go);
-    }
-    */
-}
-
-void gameobject_saveprefab(struct gameobject *go)
-{
-/*
-    char prefabfname[60] = { '\0' };
-    strncat(prefabfname, go->editor.prefabName, MAXNAME);
-    strncat(prefabfname, EXT_PREFAB, 10);
-    FILE *pfile = fopen(prefabfname, "wb+");
-    gameobject_save(go, pfile);
-    fclose(pfile);
-
-    findPrefabs();
-    */
-}
-
 void gameobject_move(struct gameobject *go, cpVect vec)
 {
     cpVect p = cpBodyGetPosition(go->body);
diff --git a/source/engine/gameobject.h b/source/engine/gameobject.h
index 73672ea..0c2c963 100644
--- a/source/engine/gameobject.h
+++ b/source/engine/gameobject.h
@@ -48,15 +48,9 @@ int shape2gameobject(cpShape *shape);
 
 void go_shape_apply(cpBody *body, cpShape *shape, struct gameobject *go);
 
-void gameobject_save(struct gameobject *go, FILE * file);
-
-void gameobject_saveprefab(struct gameobject *go);
-
 /* Tries a few methods to select a gameobject; if none is selected returns -1 */
 int pos2gameobject(cpVect pos);
 
-void gameobject_init(struct gameobject *go, FILE * fprefab);
-
 void gameobject_move(struct gameobject *go, cpVect vec);
 void gameobject_rotate(struct gameobject *go, float as);
 void gameobject_setangle(struct gameobject *go, float angle);
diff --git a/source/engine/input.c b/source/engine/input.c
index d0b3031..814820e 100644
--- a/source/engine/input.c
+++ b/source/engine/input.c
@@ -144,7 +144,6 @@ void call_input_signal(char *signal) {
     int len = arrlen(pawns);
     void *framepawns[len];
     memcpy(framepawns, pawns, len*sizeof(*pawns));
-    
     for (int i = 0; i < len; i++) {
       script_eval_w_env(signal, framepawns[i]);
     }
diff --git a/source/engine/level.c b/source/engine/level.c
index 6095fba..472e5b2 100644
--- a/source/engine/level.c
+++ b/source/engine/level.c
@@ -16,9 +16,6 @@ void save_level(char name[MAXNAME])
     int objs = arrlen(gameobjects);
     fwrite(&objs, sizeof(objs), 1, lfile);
 
-    for (int i = 0; i < objs; i++)
-	gameobject_save(&gameobjects[i], lfile);
-
     fclose(lfile);
 }
 
diff --git a/source/engine/script.c b/source/engine/script.c
index 8361f87..dd46d75 100644
--- a/source/engine/script.c
+++ b/source/engine/script.c
@@ -171,6 +171,16 @@ void unregister_obj(void *obj)
     if (guis[i].obj == obj) arrdel(nk_guis,i);
 }
 
+void unregister_gui(struct callee c)
+{
+  for (int i = arrlen(guis)-1; i >= 0; i--) {
+    if (guis[i].obj == c.obj && guis[i].fn == c.fn) {
+      arrdel(guis, i);
+      return;
+    }
+  }
+}
+
 void register_update(struct callee c) {
     arrput(updates, c);
 }
diff --git a/source/engine/script.h b/source/engine/script.h
index acfdaa4..2269388 100644
--- a/source/engine/script.h
+++ b/source/engine/script.h
@@ -36,6 +36,7 @@ time_t file_mod_secs(const char *file);
 void register_update(struct callee c);
 void call_updates(double dt);
 
+void unregister_gui(struct callee c);
 void register_gui(struct callee c);
 void register_nk_gui(struct callee c);
 void call_gui();
diff --git a/source/engine/yugine.c b/source/engine/yugine.c
index 16b2234..6e7bebe 100644
--- a/source/engine/yugine.c
+++ b/source/engine/yugine.c
@@ -55,6 +55,11 @@ static double framems[FPSBUF];
 int framei = 0;
 int fps;
 
+#define SIM_STOP 0
+#define SIM_PLAY 1
+#define SIM_PAUSE 2
+#define SIM_STEP 3
+
 void seghandle(int sig) {
 #ifdef __linux__
     void *ents[512];
@@ -190,7 +195,7 @@ int main(int argc, char **args) {
 
          if (framei == FPSBUF) framei = 0;
 
-         if (sim_play) {
+         if (sim_play == SIM_PLAY || sim_play == SIM_STEP) {
              timer_update(elapsed);
              physlag += elapsed;
              call_updates(elapsed * timescale);
@@ -199,7 +204,7 @@ int main(int argc, char **args) {
                  physlag -= physMS;
                  phys2d_update(physMS  * timescale);
                  call_physics(physMS * timescale);
-                 if (sim_play == 2) sim_pause();
+                 if (sim_play == SIM_STEP) sim_pause();
              }
        }
 
@@ -227,25 +232,27 @@ int frame_fps()
      return FPSBUF / fpsms;
 }
 
-int sim_playing() { return sim_play; }
-int sim_paused() { return (!sim_play && gameobjects_saved()); }
+int sim_playing() { return sim_play == SIM_PLAY; }
+int sim_paused() { return sim_play == SIM_PAUSE; }
+int sim_stopped() { return sim_play == SIM_STOP; }
 
 void sim_start() {
-  sim_play = 1;
+  sim_play = SIM_PLAY;
 }
 
 void sim_pause() {
-  sim_play = 0;
+  sim_play = SIM_PAUSE;
 }
 
 void sim_stop() {
     /* Revert starting state of everything from sim_start */
-  sim_play =  0;
+  sim_play =  SIM_STOP;
 }
 
 void sim_step() {
   if (sim_paused()) {
-      sim_play = 2;
+      YughInfo("Step");
+      sim_play = SIM_STEP;
   }
 }