diff --git a/conf.lua b/conf.lua
index 589f39801..823209a9c 100644
--- a/conf.lua
+++ b/conf.lua
@@ -2,7 +2,7 @@ VERSION={
 	build=344,
 	code=1506,
 	short="V0.15.6",
-	string="Alpha V0.15.6",
+	string="Alpha Fork V0.15.6",
 	room="V1.0",
 	name="强化装甲 Reinforced Armor",
 }
diff --git a/parts/globalTables.lua b/parts/globalTables.lua
index 9ce054dfb..f66fe449f 100644
--- a/parts/globalTables.lua
+++ b/parts/globalTables.lua
@@ -141,6 +141,12 @@ MODOPT={--Mod options
 		func=function(P,O)P.gameEnv.bone=O=='on'end,
 		unranked=true,
 	},
+	{no=22,id="FR",name="finesseRewind",
+		key=",",x=1040,y=470,color='Y',
+		list={'easy','strict'},
+		func=function(P,O)P.gameEnv.fineRewind=O end,
+		unranked=true,
+	},
 }
 for i=1,#MODOPT do
 	local M=MODOPT[i]
diff --git a/parts/language/lang_en.lua b/parts/language/lang_en.lua
index 81eff3e28..6aaa83460 100644
--- a/parts/language/lang_en.lua
+++ b/parts/language/lang_en.lua
@@ -42,6 +42,7 @@ return{
 	pauseCount="Pauses",
 	finesse_ap="All Perfect",
 	finesse_fc="Full Combo",
+	rewind="Finesse Rewind",
 
 	page="Page:",
 
@@ -133,6 +134,7 @@ return{
 		customSeq="Randomizer\nOverrides the randomizer for the block sequence.",
 		pushSpeed="Garbage Speed\nOverride the rising speed of garbage lines (blocks/frame).",
 		boneBlock="[ ]\nPlay with [ ] blocks.",
+		finesseRewind="Finesse Rewind\nFinesse fault resets time.\n(This mod is unstable in multiplayer/AI combat/backfire mode.)"
 	},
 	pauseStat={
 		"Time:",
diff --git a/parts/language/lang_zh.lua b/parts/language/lang_zh.lua
index b53528273..9fa6ad256 100644
--- a/parts/language/lang_zh.lua
+++ b/parts/language/lang_zh.lua
@@ -42,6 +42,7 @@ return{
 	pauseCount="暂停统计",
 	finesse_ap="All Perfect",
 	finesse_fc="Full Combo",
+	rewind="极简回溯",
 
 	page="页面:",
 
@@ -133,6 +134,7 @@ return{
 		customSeq="指定序列:\n强制使用某种序列",
 		pushSpeed="涨行速度:\n改变垃圾行升起的速度(单位:格/帧)",
 		boneBlock="骨块:\n使用骨块进行游戏",
+		finesseRewind="极简回溯：\n非极简操作将会回溯到出块时刻\n（多人/AI/自攻自受模式中不稳定）"
 	},
 	pauseStat={
 		"时间:",
diff --git a/parts/player/player.lua b/parts/player/player.lua
index f5f2ce546..31a0bd9a9 100644
--- a/parts/player/player.lua
+++ b/parts/player/player.lua
@@ -15,6 +15,45 @@ local PLAYERS,PLY_ALIVE,GAME=PLAYERS,PLY_ALIVE,GAME
 local kickList=require"parts.kickList"
 local ply_draw=require"parts.player.draw"
 local ply_update=require"parts.player.update"
+--------------------<Utility>-----------------------
+-- from my crude observations, these stuff in the blacklist shouldn't be touched upon.
+local blacklist = {
+	freeze = true,
+	keyPressing = true,
+	lastRecv = true,
+	atker = true,
+	atking = true
+}
+
+function DeepCopy (orig, i)
+	i = i or 0
+	if i > 20 then return end  -- safety belt
+	local orig_type = type(orig)
+	local copy
+	if orig_type == 'table' then
+		copy = {}
+		for orig_key, orig_value in next, orig, nil do
+			if not blacklist[orig_key] then
+				if orig_key == 'moving' or orig_key == 'downing' then
+					copy[orig_key] = 0
+				end
+				copy[DeepCopy(orig_key, i+1)] = DeepCopy(orig_value, i+1)
+			end
+		end
+		setmetatable(copy, DeepCopy(getmetatable(orig)))
+	else
+		copy = orig
+	end
+	return copy
+end
+
+function Assign (orig, dest)
+	for orig_key, orig_value in next, orig, nil do
+		dest[orig_key] = orig_value
+	end
+	setmetatable(dest, getmetatable(orig))
+end
+-----------------------</Utility>-----------------------
 
 --------------------------<FX>--------------------------
 function Player:showText(text,dx,dy,font,style,spd,stop)
@@ -809,6 +848,9 @@ function Player:popNext(ifhold)--Pop nextQueue to hand
 	else
 		self:hold()
 	end
+	if self.gameEnv.fineRewind then
+		self.freeze = DeepCopy(self)
+	end
 end
 
 function Player:cancel(N)--Cancel Garbage
@@ -1144,12 +1186,23 @@ do--Player.drop(self)--Place piece
 					SFX.play('lock',nil,self:getCenterX()*.15)
 				end
 			end
+			-- Zawarudo
+			if ENV.fineRewind=='strict' and self.freeze then
+				Assign(DeepCopy(self.freeze), self)
+				self:showText(text.rewind, 0, 0, 35, "appear", 0.6)
+				return
+			end
 		elseif self.sound then
 			SFX.play('lock',nil,self:getCenterX()*.15)
 		end
 
 		if finePts<=1 then
 			self.finesseCombo=0
+			if ENV.fineRewind=='easy' and self.freeze then
+				Assign(DeepCopy(self.freeze), self)
+				self:showText(text.rewind, 0, 0, 35, "appear", 0.6)
+				return
+			end
 		else
 			self.finesseCombo=self.finesseCombo+1
 			if self.finesseCombo>2 then