diff --git a/README.md b/README.md
index e69de29..4d2bc4e 100644
--- a/README.md
+++ b/README.md
@@ -0,0 +1,14 @@
+# 기능 목록
+<ol>게임 시작
+<ol>컴퓨터 볼 생성
+<ul>볼 중복 검사</ul>
+</ol>
+<ol>유저, 컴퓨터 볼 비교
+<ul>결과 저장</ul>
+</ol>
+<ol>조건에 맞으면 종료
+<ul>재시작 or 종료</ul>
+</ol>
+</ol>
+
+
diff --git a/build.gradle b/build.gradle
index c7156de..fd7068c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,6 +4,7 @@ plugins {
 
 group 'org.example'
 version '1.0-SNAPSHOT'
+sourceCompatibility = '8'
 
 repositories {
     mavenCentral()
diff --git a/src/main/java/com/baseball/BaseBallMainApplication.java b/src/main/java/com/baseball/BaseBallMainApplication.java
new file mode 100644
index 0000000..0c2bf27
--- /dev/null
+++ b/src/main/java/com/baseball/BaseBallMainApplication.java
@@ -0,0 +1,10 @@
+package com.baseball;
+
+import com.baseball.domain.BaseBallPlayService;
+
+public class BaseBallMainApplication {
+    public static void main(String[] args) {
+        BaseBallPlayService baseBallPlayService = new BaseBallPlayService();
+        baseBallPlayService.playGame();
+    }
+}
diff --git a/src/main/java/com/baseball/domain/Ball.java b/src/main/java/com/baseball/domain/Ball.java
new file mode 100644
index 0000000..7e81809
--- /dev/null
+++ b/src/main/java/com/baseball/domain/Ball.java
@@ -0,0 +1,37 @@
+package com.baseball.domain;
+
+public class Ball {
+    String computerBall;
+    String userBall;
+    String findBallBuffer;
+    int strikeCount = 0;
+    int ballCount = 0;
+
+    StringBuffer pitchZone = new StringBuffer();
+    StringBuilder stringBuilder = new StringBuilder();
+
+    public String createComputeBall() {
+        do {
+            int createNumber = (int) (Math.random() * 9) + 1;
+            if (createNumber > 0) {
+                stringBuilder.append(createNumber);
+                this.computerBallInspection(createNumber);
+            }
+        } while (stringBuilder.length() != 3);
+        computerBall = stringBuilder.toString();
+        stringBuilder.delete(0, stringBuilder.length());
+        findBallBuffer = computerBall;
+        return computerBall;
+    }
+
+    public void computerBallInspection(int number) {
+        if (stringBuilder.length() >= 2) {
+            int index = stringBuilder.substring(0, stringBuilder.length()-1).indexOf(String.valueOf(number));
+            if (index > -1) {
+                stringBuilder.delete(stringBuilder.length()-1, stringBuilder.length());
+                createComputeBall();
+            }
+        }
+    }
+
+}
diff --git a/src/main/java/com/baseball/domain/BaseBallPlayService.java b/src/main/java/com/baseball/domain/BaseBallPlayService.java
new file mode 100644
index 0000000..0923e2d
--- /dev/null
+++ b/src/main/java/com/baseball/domain/BaseBallPlayService.java
@@ -0,0 +1,84 @@
+package com.baseball.domain;
+
+import com.baseball.view.InputView;
+import com.baseball.view.OutputView;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class BaseBallPlayService implements BaseballPlayImpl {
+    private static final OutputView outputView = new OutputView();
+    private static final Ball ball = new Ball();
+    private static String computerBall = ball.createComputeBall();
+
+    @Override
+    public void playGame() {
+        outputView.messagePrint("START", "");
+        ball.userBall = InputView.inputBalls();
+        this.userBallNumberVerification(ball.userBall);
+        this.messageDelete();
+        this.baseBallMatching(ball.userBall);
+        if (ball.strikeCount < 3) outputView.messagePrint("GAME_RESULT", ball.pitchZone.toString());
+        else outputView.messagePrint("GAME_RESULT", "3 스트라이크");
+        this.gameRestartOrGameEnd();
+    }
+
+    public void userBallNumberVerification(String userBall) {
+        try {
+            Pattern pattern = Pattern.compile("(^[0-9]{3})");
+            Matcher matchingResult = pattern.matcher(String.valueOf(userBall));
+            if (!matchingResult.find()) throw new IllegalArgumentException();
+        } catch (IllegalArgumentException e) {
+            outputView.messagePrint("VERIFICATION", "");
+            InputView.getClose();
+            e.printStackTrace();
+            throw e;
+        }
+    }
+
+    public void baseBallMatching(String userBall) {
+        System.out.println(computerBall);
+        if (!userBall.trim().isEmpty()) {
+            if (String.valueOf(userBall.charAt(0)).equals(String.valueOf(computerBall.charAt(0)))) {
+                ball.strikeCount++;
+            }
+            if (ball.findBallBuffer.indexOf(String.valueOf(userBall.charAt(0))) > 0) {
+                ball.ballCount++;
+            }
+            userBall = userBall.substring(1);
+            computerBall = computerBall.substring(1);
+            baseBallMatching(userBall);
+        } else {
+            if (ball.strikeCount > 0) ball.pitchZone.append(ball.strikeCount).append(" 스트라이크 ");
+            if (ball.ballCount > 0) ball.pitchZone.append(ball.ballCount).append(" 볼");
+        }
+    }
+
+    public void gameRestartOrGameEnd() {
+        int coin = 0;
+        if (ball.strikeCount < 3) {
+            computerBall = String.valueOf(ball.computerBall);
+            playGame();
+        } else {
+            outputView.messagePrint("GAME_COMPLETE", ball.pitchZone.toString());
+            coin = InputView.inputCoin();
+        }
+        this.messageDelete();
+        if (coin == 1) this.gameReset();
+        else InputView.getClose();
+    }
+
+    public void gameReset() {
+        computerBall = ball.createComputeBall();
+        ball.strikeCount = 0;
+        ball.ballCount = 0;
+        this.playGame();
+    }
+
+    public void messageDelete() {
+        ball.strikeCount = 0;
+        ball.ballCount = 0;
+        ball.pitchZone.delete(0, ball.pitchZone.length());
+    }
+
+}
diff --git a/src/main/java/com/baseball/domain/BaseballPlayImpl.java b/src/main/java/com/baseball/domain/BaseballPlayImpl.java
new file mode 100644
index 0000000..804e623
--- /dev/null
+++ b/src/main/java/com/baseball/domain/BaseballPlayImpl.java
@@ -0,0 +1,7 @@
+package com.baseball.domain;
+
+import java.io.IOException;
+
+public interface BaseballPlayImpl {
+    void playGame() throws IOException;
+}
diff --git a/src/main/java/com/baseball/mssage/Message.java b/src/main/java/com/baseball/mssage/Message.java
new file mode 100644
index 0000000..636a0db
--- /dev/null
+++ b/src/main/java/com/baseball/mssage/Message.java
@@ -0,0 +1,18 @@
+package com.baseball.mssage;
+
+public enum Message {
+    START_MESSAGE("숫자를 입력해주세요 : "),
+    VERIFICATION_MESSAGE("볼 입력이 잘못되었습니다."),
+    GAME_RESULT_MESSAGE("낫 싱"),
+    GAME_COMPLETE_MESSAGE("3개의 숫자를 모두 맞히셨습니다! 게임 종료 \n게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+
+    private final String message;
+
+    Message(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+}
diff --git a/src/main/java/com/baseball/view/InputView.java b/src/main/java/com/baseball/view/InputView.java
new file mode 100644
index 0000000..94f8c08
--- /dev/null
+++ b/src/main/java/com/baseball/view/InputView.java
@@ -0,0 +1,22 @@
+package com.baseball.view;
+
+import java.util.Scanner;
+
+public class InputView {
+    private static Scanner scanner;
+    public static String inputBalls() {
+        scanner = new Scanner(System.in);
+        return scanner.nextLine();
+    }
+
+    public static int inputCoin() {
+        scanner = new Scanner(System.in);
+        return scanner.nextInt();
+    }
+
+    public static void getClose() {
+        scanner.close();
+    }
+
+
+}
diff --git a/src/main/java/com/baseball/view/OutputView.java b/src/main/java/com/baseball/view/OutputView.java
new file mode 100644
index 0000000..2a9848f
--- /dev/null
+++ b/src/main/java/com/baseball/view/OutputView.java
@@ -0,0 +1,24 @@
+package com.baseball.view;
+
+import com.baseball.mssage.Message;
+
+public class OutputView {
+
+    public void messagePrint(String message, String resultMessage) {
+        switch (message) {
+            case "START":
+                System.out.println(Message.START_MESSAGE.getMessage());
+                break;
+            case "VERIFICATION":
+                System.out.println(Message.VERIFICATION_MESSAGE.getMessage());
+                break;
+            case "GAME_RESULT":
+                if (!resultMessage.isEmpty()) System.out.println(resultMessage);
+                else System.out.println(Message.GAME_RESULT_MESSAGE.getMessage());
+                break;
+            case "GAME_COMPLETE":
+                System.out.println(Message.GAME_COMPLETE_MESSAGE.getMessage());
+                break;
+        }
+    }
+}
diff --git a/src/main/java/empty.txt b/src/main/java/empty.txt
deleted file mode 100644
index e69de29..0000000