diff --git a/chameleonic.p8 b/chameleonic.p8
index b5e3e04..4c5748c 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -337,6 +337,15 @@ function level:recollide()
  end
 end
 
+function add_adjacent_anchors(tbl,mx,my)
+ for ax in all{mx*2-1,mx*2+2} do
+  for ay in all{my*2-1,my*2+2} do
+   local px,py=level:a2p(ax,ay)
+   tbl[_amix(ax,ay)]={ax=ax0,ay=ay0,x=px,y=py}
+  end
+ end
+end
+
 function level:reanchor(remove)
  if remove or not self._anch then
   self._anch={}
@@ -362,12 +371,7 @@ function level:reanchor(remove)
  end
 
  for _,cr in pairs(self._crates) do
-  for ax in all{cr.mx*2-1,cr.mx*2+2} do
-   for ay in all{cr.my*2-1,cr.my*2+2} do
-    local px,py=self:a2p(ax,ay)
-    self._anch[_amix(ax,ay)]={ax=ax0,ay=ay0,x=px,y=py}
-   end
-  end
+  add_adjacent_anchors(self._anch,cr.mx,cr.my)
  end
 
  if (player.rope!=nil) player.rope:make_dirty()
@@ -1034,29 +1038,29 @@ function rope:drag(
    a.y=y
    a.dirty=true
    self.dirty=true
+   --self:_find_needed_anchors(i())
+   --self:_find_needed_anchors(i()+1)
    if (not busy) self:_tidy_up_gen()
   end
  end
 end
 
-function rope:make_dirty()
- for a=0,#self.ancs+1 do
-  self:_anc(a).dirty=true
+function rope:make_dirty(only_if_invalid)
+ local invalid=false
+ for a=0,#self.ancs do
+  local a0=self:_anc(a)
+  local a1=self:_anc(a+1)
+  if not self:_can_stretch(a0,a1) then
+   a0.dirty=true
+   a1.dirty=true
+   invalid=true
+  end
  end
- self.dirty=true
+ if (invalid or not only_if_invalid) self.dirty=true
 end
 
 function rope:_tidy_up_gen()
- local invalid=false
- for i=0,#self.ancs do
-  local a0=self:_anc(i)
-  local a1=self:_anc(i+1)
-  if not self:_can_stretch(a0,a1) then
-   invalid=true
-   break
-  end
- end
- if (invalid) self:make_dirty() 
+ self:make_dirty(true) 
 
  local busy=self:busy()
  if (not self:latched()) return
@@ -1131,7 +1135,7 @@ function rope:_tidy_up_gen()
  self.dirty=false
 end
 
-function rope:_find_needed_anchors(i)
+function rope:_find_needed_anchors(i,busy)
  if (i<=0) return false
  if (#self.ancs+1<i) return false
 
@@ -1376,7 +1380,7 @@ function rope:_rast(
    if (x==x1) done=true return x1,y1
    local oldx,oldy=x,y
    err-=dy
-   if (err<0) y+=sy err+=dx
+   if (err<0) y+=sy err+=dx+dy return oldx,y
    x+=sx
    return oldx,oldy
   end
@@ -1387,7 +1391,7 @@ function rope:_rast(
    if (y==y1) done=true return x1,y1
    local oldx,oldy=x,y
    err-=dx
-   if (err<0) x+=sx err+=dy
+   if (err<0) x+=sx err+=dy+dx return x,oldy
    y+=sy
    return oldx,oldy
   end
@@ -1444,16 +1448,12 @@ function rope:_tug(hypothetically)
 
  for i=#ancs-1,2,-1 do
   local ops_before_trash,hit_end1=self:_calc_push(ancs[i+1],ancs[i],ancs[i-1],ancs[i-2])
-  local ops_to_do,corners={},{}
+  local ops_to_do,corners={}
   if #ops_before_trash>0 then 
    ops_to_do=ops_before_trash 
-   corners[i-1]=true
-   corners[i]=hit_end1
   else 
    local ops_after_trash,hit_end2=self:_calc_push(ancs[i-2],ancs[i-1],ancs[i],ancs[i+1])
    ops_to_do=ops_after_trash
-   corners[i-1]=true
-   corners[i]=hit_end1
   end
 
   local ops=ops_to_do
@@ -1462,10 +1462,10 @@ function rope:_tug(hypothetically)
    if (hypothetically) return ancs,i-1
 
    local dmx,dmy=ops[1].dmx,ops[1].dmy
+   local adjacent_ancs={}
    for o in all(ops) do
-    level:tug_crate(
-     o.mx,o.my,dmx,dmy
-    )
+    add_adjacent_anchors(adjacent_ancs,o.mx,o.my)
+    level:tug_crate(o.mx,o.my,o.dmx,o.dmy)
    end
    for node=ancs[i-1].ix,ancs[i].ix do
     local anc=self:_anc(node)
@@ -1483,7 +1483,8 @@ function rope:_tug(hypothetically)
      end}
     end
     local dmxh,dmyh=dmx,dmy
-    if (not corners[node]) dmxh,dmyh=0,0
+    local ax,ay=level:p2a(x0,y0)
+    if (adjacent_ancs[_amix(ax,ay)]==nil) dmxh,dmyh=0,0
     anc.todo={
      {},
      upd(x0+dmxh*2,y0+dmyh*2),
@@ -1857,7 +1858,7 @@ __map__
 0c000000000000000c0c0c0c0c0c0c0c0c00000000000020210000000000000c00000000000e00000e0e0000000000000e0000000000000e0e0e0000000000000e000000000e0e0e0e0e0000000000000e00000000000e0000000000000000000e00000000000e0e0e000000000000000e000000000000000e00000000000000
 0c0c0c0c0c0c00000000000c0c0c0c0c0c00000000000030310000000000000c000000000000000e0e000000000000000e00000000000000000e0000000000000e0000000000000e00000000000000000e00000000000e0e0e000000000000000e00000000000e00000e0000000000000e0000000000000e0000000000000000
 0c00000000000c0c004f000c0c0c0c0c0c00000000000000000000000000000c0000000000000e0e00000000000000000e00000000000e0e0e0e0000000000000e0000000000000e00000000000000000e000000000000000e000000000000000e0000000000000e0e000000000000000e0000000000000e0000000000000000
-0c00000c4f00000c00000000000000120100000000000000000000000000000c00000000000e0e0e0e0e0000000000000e0000000000000000000000000000000e0000000000000e00000000000000000e00000000000e0e0e000000000000000e0000000000000000000000000000000e000000000000000000000000000000
+0c00000c4f00000000000000000000120100000000000000000000000000000c00000000000e0e0e0e0e0000000000000e0000000000000000000000000000000e0000000000000e00000000000000000e00000000000e0e0e000000000000000e0000000000000000000000000000000e000000000000000000000000000000
 3d0000000000003f0c000c0c0c0c0c0c0c00000000000000000000000000000c000000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e000000000000000000000000000000
 0c0000000000000000000c0c0c0c0c0c0c00000000000000000000000000000c000000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e000000000000000000000000000000
 010000000000000c0c0c0c0c0c0c0c0c0c00000000000000000000000000000c000000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e0000000000000000000000000000000e000000000000000000000000000000