diff --git a/main.lua b/main.lua
index e5b0d36e..6afb352c 100644
--- a/main.lua
+++ b/main.lua
@@ -426,6 +426,7 @@ do
     end
     if RANKS.bigbang then fs.remove('record/bigbang.rec') end
     if RANKS.clearRush then fs.remove('record/clearRush.rec') end
+    if STAT.version<1715 then fs.remove('record/dig_quad_10l.rec') end
 
     if STAT.version~=VERSION.code then
         for k,v in next,MODE_UPDATE_MAP do
diff --git a/parts/modes/dig_quad_10l.lua b/parts/modes/dig_quad_10l.lua
index a1c9038d..91af65d7 100644
--- a/parts/modes/dig_quad_10l.lua
+++ b/parts/modes/dig_quad_10l.lua
@@ -1,8 +1,7 @@
 return {
     env={
-        pushSpeed=6,
         lock=1e99, infHold=true,
-        bg='bg1',bgm='way',
+        bg='bg2',bgm='way',
         mesDisp=function(P)
             setFont(55)
             GC.mStr(10-P.stat.dig_quad,63,265)
@@ -11,39 +10,38 @@ return {
             if P.lastPiece.row>0 and P.lastPiece.row<4 then
                 P:lose()
             else
-                P.stat.dig_quad = P.stat.dig
+                P.stat.dig_quad=P.stat.dig
             end
             if P.stat.dig==10 then
                 P:win('finish')
             end
         end,
         task=function(P)
-            local last = -1
+            local last=-1
             for _=1,10 do
-                local garbage = last
+                local garbage=last
                 repeat
-                    garbage = P:getHolePos()
-                until garbage ~= last
-                last = garbage
+                    garbage=P:getHolePos()
+                until garbage~=last
+                last=garbage
                 P:garbageRise(21,1,garbage)
             end
             P.fieldBeneath=0
-            P.stat.dig_quad = 0
+            P.stat.dig_quad=0
         end,
     },
-    score=function(P) return {P.stat.dig_quad,P.stat.piece} end,
-    scoreDisp=function(D) return D[1].." Techrash "..D[2].." Pieces" end,
+    score=function(P) return {P.stat.dig_quad,P.stat.time} end,
+    scoreDisp=function(D) return D[1].." Techrash "..STRING.time(D[2]) end,
     comp=function(a,b) return a[1]>b[1] or a[1]==b[1] and a[2]<b[2] end,
     getRank=function(P)
-        local dig = P.stat.dig_quad
-        local piece = P.stat.piece
-        if dig < 4 then return end
+        local dig=P.stat.dig_quad
+        if dig<=1 then return end
         return
-            dig < 7 and 0 or
-            dig < 10 and 1 or
-            piece > 103 and 2 or
-            piece > 92 and 3 or
-            piece > 81 and 4 or
-            5
+            dig==10 and 5 or
+            dig>=7 and 4 or
+            dig>=5 and 3 or
+            dig>=3 and 2 or
+            dig>=2 and 1 or
+            0
     end,
 }