diff --git a/parts/eventsets/get_drop_lineTarget.lua b/parts/eventsets/get_drop_lineTarget.lua
deleted file mode 100644
index 749c327c..00000000
--- a/parts/eventsets/get_drop_lineTarget.lua
+++ /dev/null
@@ -1,11 +0,0 @@
-return setmetatable({},{
-    __index=function(self,k)
-        assert(type(k)=='number'and k>0)
-        self[k]=function(P)
-            if P.stat.row>=k then
-                P:win('finish')
-            end
-        end
-        return self[k]
-    end
-})
\ No newline at end of file
diff --git a/parts/eventsets/pc_inf.lua b/parts/eventsets/pc_inf.lua
index 3686cd99..7b0c0df4 100644
--- a/parts/eventsets/pc_inf.lua
+++ b/parts/eventsets/pc_inf.lua
@@ -1,13 +1,18 @@
-return function(P)
-    if P.lastPiece.pc then
+return{
+    task=function(P)
         P.gameEnv.heightLimit=4
-        if P.stat.pc%5==0 then
-            P.gameEnv.drop=math.max(P.gameEnv.drop-1,1)
+    end,
+    dropPiece=function(P)
+        if P.lastPiece.pc then
+            P.gameEnv.heightLimit=4
+            if P.stat.pc%5==0 then
+                P.gameEnv.drop=math.max(P.gameEnv.drop-1,1)
+            end
+        else
+            P.gameEnv.heightLimit=P.gameEnv.heightLimit-P.lastPiece.row
+        end
+        if #P.field>P.gameEnv.heightLimit then
+            P:lose()
         end
-    else
-        P.gameEnv.heightLimit=P.gameEnv.heightLimit-P.lastPiece.row
     end
-    if #P.field>P.gameEnv.heightLimit then
-        P:lose()
-    end
-end
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/parts/modes/pc_inf.lua b/parts/modes/pc_inf.lua
index 2b44840f..977f0651 100644
--- a/parts/modes/pc_inf.lua
+++ b/parts/modes/pc_inf.lua
@@ -4,7 +4,6 @@ return{
         drop=20,lock=60,
         fall=10,
         freshLimit=8,
-        heightLimit=4,
         ospin=false,
         eventSet='pc_inf',
         bg='rgb',bgm='moonbeam',