diff --git a/src/modules/guessing-game/index.ts b/src/modules/guessing-game/index.ts
index 006c77f..4fb68d6 100644
--- a/src/modules/guessing-game/index.ts
+++ b/src/modules/guessing-game/index.ts
@@ -7,6 +7,7 @@ import getCollection from '../../utils/get-collection';
 
 export default class GuessingGameModule extends Module {
 	public readonly name = 'guessingGame';
+
 	private guesses: loki.Collection<{
 		userId: string;
 		secret: number;
@@ -32,41 +33,39 @@ export default class GuessingGameModule extends Module {
 
 	@autobind
 	private mentionHook(msg: MessageLike) {
-		if (msg.includes(['数当て', '数あて'])) {
-			const exist = this.guesses.findOne({
-				userId: msg.userId,
-				isEnded: false
-			});
+		if (!msg.includes(['数当て', '数あて'])) return false;
 
-			if (!msg.isMessage) {
-				if (exist != null) {
-					msg.reply(serifs.guessingGame.arleadyStarted);
-				} else {
-					msg.reply(serifs.guessingGame.plzDm);
-				}
+		const exist = this.guesses.findOne({
+			userId: msg.userId,
+			isEnded: false
+		});
 
-				return true;
+		if (!msg.isMessage) {
+			if (exist != null) {
+				msg.reply(serifs.guessingGame.arleadyStarted);
+			} else {
+				msg.reply(serifs.guessingGame.plzDm);
 			}
 
-			const secret = Math.floor(Math.random() * 100);
-
-			this.guesses.insertOne({
-				userId: msg.userId,
-				secret: secret,
-				tries: [],
-				isEnded: false,
-				startedAt: Date.now(),
-				endedAt: null
-			});
-
-			msg.reply(serifs.guessingGame.started).then(reply => {
-				this.subscribeReply(msg.userId, msg.isMessage, msg.isMessage ? msg.userId : reply.id);
-			});
-
 			return true;
-		} else {
-			return false;
 		}
+
+		const secret = Math.floor(Math.random() * 100);
+
+		this.guesses.insertOne({
+			userId: msg.userId,
+			secret: secret,
+			tries: [],
+			isEnded: false,
+			startedAt: Date.now(),
+			endedAt: null
+		});
+
+		msg.reply(serifs.guessingGame.started).then(reply => {
+			this.subscribeReply(msg.userId, msg.isMessage, msg.isMessage ? msg.userId : reply.id);
+		});
+
+		return true;
 	}
 
 	@autobind
@@ -93,44 +92,44 @@ export default class GuessingGameModule extends Module {
 			msg.reply(serifs.guessingGame.nan).then(reply => {
 				this.subscribeReply(msg.userId, msg.isMessage, reply.id);
 			});
-		} else {
-			if (guess.length > 3) return;
-
-			const g = parseInt(guess[0], 10);
-
-			const firsttime = exist.tries.indexOf(g) === -1;
-
-			exist.tries.push(g);
-
-			let text: string;
-			let end = false;
-
-			if (exist.secret < g) {
-				text = firsttime
-					? serifs.guessingGame.less(g.toString())
-					: serifs.guessingGame.lessAgain(g.toString());
-			} else if (exist.secret > g) {
-				text = firsttime
-					? serifs.guessingGame.grater(g.toString())
-					: serifs.guessingGame.graterAgain(g.toString());
-			} else {
-				end = true;
-				text = serifs.guessingGame.congrats(exist.tries.length.toString());
-			}
-
-			if (end) {
-				exist.isEnded = true;
-				exist.endedAt = Date.now();
-				this.unsubscribeReply(msg.userId);
-			}
-
-			this.guesses.update(exist);
-
-			msg.reply(text).then(reply => {
-				if (!end) {
-					this.subscribeReply(msg.userId, msg.isMessage, reply.id);
-				}
-			});
+			return;
 		}
+
+		if (guess.length > 3) return;
+
+		const g = parseInt(guess[0], 10);
+		const firsttime = exist.tries.indexOf(g) === -1;
+
+		exist.tries.push(g);
+
+		let text: string;
+		let end = false;
+
+		if (exist.secret < g) {
+			text = firsttime
+				? serifs.guessingGame.less(g.toString())
+				: serifs.guessingGame.lessAgain(g.toString());
+		} else if (exist.secret > g) {
+			text = firsttime
+				? serifs.guessingGame.grater(g.toString())
+				: serifs.guessingGame.graterAgain(g.toString());
+		} else {
+			end = true;
+			text = serifs.guessingGame.congrats(exist.tries.length.toString());
+		}
+
+		if (end) {
+			exist.isEnded = true;
+			exist.endedAt = Date.now();
+			this.unsubscribeReply(msg.userId);
+		}
+
+		this.guesses.update(exist);
+
+		msg.reply(text).then(reply => {
+			if (!end) {
+				this.subscribeReply(msg.userId, msg.isMessage, reply.id);
+			}
+		});
 	}
 }