diff --git a/public/src/js/controller.js b/public/src/js/controller.js
index cb20acd..ca7e0c3 100644
--- a/public/src/js/controller.js
+++ b/public/src/js/controller.js
@@ -60,6 +60,11 @@ class Controller{
 		this.view = new View(this)
 		this.mekadon = new Mekadon(this, this.game)
 		this.keyboard = new GameInput(this)
+		if(!autoPlayEnabled && this.multiplayer !== 2){
+			this.easierBigNotes = settings.getItem("easierBigNotes") || this.keyboard.keyboard.TaikoForceLv5
+		}else{
+			this.easierBigNotes = false
+		}
 		
 		this.drumSounds = settings.getItem("latency").drumSounds
 		this.playedSounds = {}
diff --git a/public/src/js/game.js b/public/src/js/game.js
index bb790ba..60c02da 100644
--- a/public/src/js/game.js
+++ b/public/src/js/game.js
@@ -104,7 +104,9 @@ class Game{
 						circle.beatMSCopied = true
 					}
 				}
-				if(ms > endTime){
+				if(circle.daiFailed && (ms >= circle.daiFailed.ms + this.rules.daiLeniency || ms > endTime)){
+					this.checkScore(circle, circle.daiFailed.check)
+				}else if(ms > endTime){
 					if(!this.controller.autoPlayEnabled){
 						if(drumrollNotes){
 							if(circle.section && circle.timesHit === 0){
@@ -314,7 +316,7 @@ class Game{
 		var typeDai = type === "daiDon" || type === "daiKa"
 		
 		var keyTime = this.controller.getKeyTime()
-		var currentTime = keysDon ? keyTime["don"] : keyTime["ka"]
+		var currentTime = circle.daiFailed ? circle.daiFailed.ms : keysDon ? keyTime["don"] : keyTime["ka"]
 		var relative = currentTime - circle.ms - this.controller.audioLatency
 		
 		if(relative >= this.rules.ok){
@@ -330,14 +332,6 @@ class Game{
 			}
 			var score = 0
 			if(keysDon && typeDon || keysKa && typeKa){
-				if(typeDai && !keyDai){
-					if(!circle.daiFailed){
-						circle.daiFailed = ms
-						return false
-					}else if(ms < circle.daiFailed + this.rules.daiLeniency){
-						return false
-					}
-				}
 				var circleStatus = -1
 				relative = Math.abs(relative)
 				if(relative < this.rules.good){
@@ -347,6 +341,23 @@ class Game{
 				}else if(relative < this.rules.bad){
 					circleStatus = 0
 				}
+				if(typeDai && !keyDai){
+					if(this.controller.easierBigNotes){
+						// Taiko Force Lv5 can't hit both Dons at the same time, so dai offered
+						keyDai = true
+					}else if(!circle.daiFailed){
+						circle.daiFailed = {
+							ms: ms,
+							status: circleStatus,
+							check: check
+						}
+						return false
+					}else if(ms < circle.daiFailed.ms + this.rules.daiLeniency){
+						return false
+					}else{
+						circleStatus = circle.daiFailed.status
+					}
+				}
 				if(circleStatus === 230 || circleStatus === 450){
 					score = circleStatus
 				}
diff --git a/public/src/js/keyboard.js b/public/src/js/keyboard.js
index 949673b..d13ab7a 100644
--- a/public/src/js/keyboard.js
+++ b/public/src/js/keyboard.js
@@ -14,12 +14,18 @@ class Keyboard{
 			"altgr": "altgraph"
 		}
 		this.btn = {}
+		this.TaikoForceLv5 = false;
 		this.update()
 		pageEvents.keyAdd(this, "all", "both", this.keyEvent.bind(this))
 		pageEvents.blurAdd(this, this.blurEvent.bind(this))
 	}
+	isTaikoForceLv5(kbdSettings){
+		// the key of Taiko Force Lv5's PC module looks like this
+		return (kbdSettings.ka_l[0] === "f") && (kbdSettings.ka_r[0] === "e") && (kbdSettings.don_l[0] === "i") && (kbdSettings.don_r[0] === "j");
+	}
 	update(){
 		var kbdSettings = settings.getItem("keyboardSettings")
+		this.TaikoForceLv5 = this.isTaikoForceLv5(kbdSettings)
 		var drumKeys = {}
 		for(var name in kbdSettings){
 			var keys = kbdSettings[name]
diff --git a/public/src/js/settings.js b/public/src/js/settings.js
index b2deaef..c52dcd1 100644
--- a/public/src/js/settings.js
+++ b/public/src/js/settings.js
@@ -46,6 +46,10 @@ class Settings{
 					"video": 0,
 					"drumSounds": true
 				}
+			},
+			easierBigNotes: {
+				type: "toggle",
+				default: false
 			}
 		}
 		
diff --git a/public/src/js/strings.js b/public/src/js/strings.js
index 4ff9367..2b76c46 100644
--- a/public/src/js/strings.js
+++ b/public/src/js/strings.js
@@ -151,6 +151,9 @@
 			video: "Video",
 			drumSounds: "Drum Sounds"
 		},
+		easierBigNotes: {
+			name: "簡単な大きな音符"
+		},
 		on: "オン",
 		off: "オフ",
 		default: "既定値にリセット",
@@ -343,6 +346,9 @@ function StringsEn(){
 			video: "Video",
 			drumSounds: "Drum Sounds"
 		},
+		easierBigNotes: {
+			name: "Easier Big Notes"
+		},
 		on: "On",
 		off: "Off",
 		default: "Reset to Defaults",
@@ -535,6 +541,9 @@ function StringsCn(){
 			video: "Video",
 			drumSounds: "Drum Sounds"
 		},
+		easierBigNotes: {
+			name: "简单的大音符"
+		},
 		on: "开",
 		off: "关",
 		default: "重置为默认值",
@@ -727,6 +736,9 @@ function StringsTw(){
 			video: "Video",
 			drumSounds: "Drum Sounds"
 		},
+		easierBigNotes: {
+			name: "簡單的大音符"
+		},
 		on: "開",
 		off: "關",
 		default: "重置為默認值",
@@ -919,6 +931,9 @@ function StringsKo(){
 			video: "Video",
 			drumSounds: "Drum Sounds"
 		},
+		easierBigNotes: {
+			name: "쉬운 큰 음표"
+		},
 		on: "온",
 		off: "오프",
 		default: "기본값으로 재설정",