diff --git a/README.md b/README.md
index 8d7e8aee..45d9515a 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,28 @@
-# java-baseball-precourse
\ No newline at end of file
+# java-baseball-precourse
+## 기능 구현
+### 1. 1~9까지의 서로 다른 임의의 수 3개 생성
+### 2. 게임 플레이어에게 수를 입력 받음
+  1) 사용자 입력 검증  
+     1-1) 사용자가 잘못된 값을 입력할 경우, IllegalArgumentException 을 발생시킨 후 애플리케이션은 종료
+       - 1 ~ 9가 아닌 다른 문자를 입력한 경우
+       - 1 ~ 9 사이의 숫자를 입력했지만 중복되는 수가 있는 경우
+         
+     1-2)  사용자가 제대로 된 값을 입력한 경우, 게임을 진행함
+       - 1 ~ 9 사이의 서로 다른 임의의 수 3개인 경우
+     
+     게임이 종료되기 전 까지 사용자에게 계속 값을 입력 받음
+     
+### 3. 게임 로직 처리
+  1) 컴퓨터가 생성한 값과 사용자가 입력한 값 중 일치하는 것이 있나 확인함
+     - 반복문을 통해 먼저 스트라이크가 존재하는지 확인
+     - 스트라이크가 있다면, 다음 index의 스트라이크 판단
+     - 스트라이크가 아닌 경우, 볼인지 판단
+     - 볼도 아니라면 다음 값으로 넘어가서 위의 과정 반복
+       
+  2) 사용자가 입력한 값의 스트라이크 개수와 볼 개수 확인
+     - 스트라이크와 볼 개수를 더한 값이 0 : 낫싱
+     - 스트라이크와 볼 개수를 더한 값이 0이 아니라면, 스트라이크와 볼 수 출력
+     
+### 4. 게임을 종료한 후 게임을 다시 시작하거나 완전 종료할 수 있게 함
+  - 게임을 새로 시작하려면 1, 종료하려면 2룰 입력하개 함
+  - 1,2 가 아닌 값을 입력할 경우, 다시 입력하게 함
diff --git a/src/main/java/baseball/Application.java b/src/main/java/baseball/Application.java
new file mode 100644
index 00000000..e6713556
--- /dev/null
+++ b/src/main/java/baseball/Application.java
@@ -0,0 +1,10 @@
+package baseball;
+
+import baseball.controller.BaseballGameController;
+
+public class Application {
+    public static void main(String[] args) {
+        BaseballGameController controller = new BaseballGameController();
+        controller.run();
+    }
+}
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diff --git a/src/main/java/baseball/controller/BaseballGameController.java b/src/main/java/baseball/controller/BaseballGameController.java
new file mode 100644
index 00000000..dcd4b36a
--- /dev/null
+++ b/src/main/java/baseball/controller/BaseballGameController.java
@@ -0,0 +1,57 @@
+package baseball.controller;
+
+import baseball.service.GameService;
+import baseball.view.GameMessage;
+import baseball.view.RequestInput;
+import java.util.Scanner;
+
+public class BaseballGameController {
+    final int SIZE = 3;
+    final int START= 1;
+    final int END = 9;
+    final int RETRY = 1;
+    final int GAME_OVER = 2;
+
+    GameService gameService = new GameService();
+    private Scanner scanner = new Scanner(System.in);
+
+    public void run() throws IllegalArgumentException {
+        setGame();
+        startGame();
+        endGame();
+        askRetry();
+    }
+
+    private void setGame() {
+        gameService.setGame(SIZE, START, END);
+    }
+
+    private void startGame() throws IllegalArgumentException {
+        gameService.playGame();
+    }
+
+    private void endGame() {
+        GameMessage.printGameOverMessage();
+    }
+
+    /*
+     - 유저입력이 (문자 or 개수가 0 or 3 이상)  : Exception
+     - 유저입력이 (1)                        : 재시작
+     - 유저입력이 (2)                        : 종료
+     */
+    private void askRetry() throws IllegalArgumentException {
+        RequestInput.printRetryMessage();
+        if (getInputNum() == RETRY) {
+            run();
+        }
+    }
+
+    private int getInputNum() throws IllegalArgumentException {
+        int inputNum = Integer.parseInt(scanner.nextLine());
+
+        if (inputNum == 0 || inputNum > GAME_OVER) {
+            throw new IllegalArgumentException();
+        }
+        return inputNum;
+    }
+}
diff --git a/src/main/java/baseball/domain/Game.java b/src/main/java/baseball/domain/Game.java
new file mode 100644
index 00000000..b77725e9
--- /dev/null
+++ b/src/main/java/baseball/domain/Game.java
@@ -0,0 +1,36 @@
+package baseball.domain;
+
+public class Game {
+    int strikeCount;
+    int ballCount;
+    int[] gameNumbers;
+
+    public Game(int[] numbers) {
+        gameNumbers = numbers;
+    }
+
+    public void initBaseBall() {
+        strikeCount = 0;
+        ballCount = 0;
+    }
+
+    public int getStrikeCount() {
+        return strikeCount;
+    }
+
+    public int getBallCount() {
+        return ballCount;
+    }
+
+    public int[] getGameNumbers() {
+        return gameNumbers;
+    }
+
+    public void increaseStrikeCount() {
+        strikeCount += 1;
+    }
+
+    public void increaseBallCount() {
+        ballCount += 1;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/baseball/domain/User.java b/src/main/java/baseball/domain/User.java
new file mode 100644
index 00000000..8d23b21c
--- /dev/null
+++ b/src/main/java/baseball/domain/User.java
@@ -0,0 +1,13 @@
+package baseball.domain;
+
+public class User {
+    int[] userNumbers;
+
+    public int[] getUserNumbers() {
+        return userNumbers;
+    }
+
+    public void setUserNumbers(int[] userNumbers) {
+        this.userNumbers = userNumbers;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/baseball/service/GameService.java b/src/main/java/baseball/service/GameService.java
new file mode 100644
index 00000000..3fcee947
--- /dev/null
+++ b/src/main/java/baseball/service/GameService.java
@@ -0,0 +1,70 @@
+package baseball.service;
+
+import baseball.domain.Game;
+import baseball.domain.User;
+import baseball.utils.Parse;
+import baseball.utils.GenerateRandomNum;
+import baseball.view.RequestInput;
+import baseball.view.GameMessage;
+import java.util.Scanner;
+
+public class GameService {
+
+    int size;
+    Game game;
+    User user = new User();
+    Parse parser = new Parse();
+    GameMessage systemMessage = new GameMessage();
+    private final Scanner scanner = new Scanner(System.in);
+    public void setGame(int size, int start, int end) {
+        this.size = size;
+        game = new Game(GenerateRandomNum.getRandomNumbers(size, start, end));
+    }
+
+    public void playGame() {
+        int strike = 0;
+        while (strike != 3) {
+            play();
+            systemMessage.printScoreMessage(game.getBallCount(), game.getStrikeCount());
+            strike = game.getStrikeCount();
+        }
+    }
+
+    private void play() {
+        game.initBaseBall();
+        user.setUserNumbers(getUserNumber());
+        computeScore();
+    }
+
+    private int[] getUserNumber() throws IllegalArgumentException {
+        RequestInput.requestInputData();
+        String input = scanner.nextLine();
+        return parser.parseUserInput(input, size);
+    }
+
+    private void computeScore() {
+        for (int i = 0; i < size; i++) {
+            compute(game.getGameNumbers(), user.getUserNumbers(), i);
+        }
+    }
+
+    private void compute(int[] gameNumber, int[] userNumber, int index) {
+        int temp = -1;
+        for (int i = 0; i < gameNumber.length; i++) {
+            if (gameNumber[i] == userNumber[index]) {
+                temp = i;
+                break;
+            }
+        }
+        increaseCount(index, temp);
+    }
+
+    private void increaseCount(int index, int temp) {
+        if (temp != index && temp != -1) {
+            game.increaseBallCount();
+        }
+        if (temp == index) {
+            game.increaseStrikeCount();
+        }
+    }
+}
diff --git a/src/main/java/baseball/utils/GenerateRandomNum.java b/src/main/java/baseball/utils/GenerateRandomNum.java
new file mode 100644
index 00000000..07f0e6a8
--- /dev/null
+++ b/src/main/java/baseball/utils/GenerateRandomNum.java
@@ -0,0 +1,33 @@
+package baseball.utils;
+
+import java.util.Random;
+public class GenerateRandomNum {
+    private static final Random random = new Random();
+    public static int[] getRandomNumbers(int size, int start, int end) {
+        int[] numbers = new int[size];
+
+        for (int i = 0; i < size; i++) {
+            numbers[i] = getUniqueRandomNumber(numbers, start, end, i);
+        }
+        return numbers;
+    }
+
+    private static int getUniqueRandomNumber(int[] numbers, int start, int end, int i) {
+        // start와 end 사이의 랜덤 숫자 생성
+        int randomNumber = start + random.nextInt(end - start + 1);
+        while (!isUnique(numbers, i, randomNumber)) {
+            // 랜덤 숫자가 유니크하지 않으면 새로운 랜덤 숫자 생성
+            randomNumber = start + random.nextInt(end - start + 1);
+        }
+        return randomNumber;
+    }
+
+    private static Boolean isUnique(int[] numbers, int i, int randomNumber) {
+        for (int j = 0; j < i; j++) {
+            if (numbers[j] == randomNumber) {
+                return false;
+            }
+        }
+        return true;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/baseball/utils/Parse.java b/src/main/java/baseball/utils/Parse.java
new file mode 100644
index 00000000..467eb8f7
--- /dev/null
+++ b/src/main/java/baseball/utils/Parse.java
@@ -0,0 +1,35 @@
+package baseball.utils;
+
+public class Parse {
+
+    public int[] parseUserInput(String input, int size) throws IllegalArgumentException {
+        checkSize(input, size);
+        return getParseInt(input, size);
+    }
+
+    private void checkSize(String input, int size) throws IllegalArgumentException {
+        if (input.length() != size) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    private int[] getParseInt(String input, int size) throws IllegalArgumentException {
+        int[] parseInt = new int[size];
+
+        for (int i = 0; i < input.length(); i++) {
+            if (!checkDigit(input, i)) {
+                throw new IllegalArgumentException();
+            }
+            parseInt[i] = convertCharToInt(input, i);
+        }
+        return parseInt;
+    }
+
+    private int convertCharToInt(String input, int i) {
+        return input.charAt(i) - '0';
+    }
+
+    private Boolean checkDigit(String input, int i) {
+        return '0' <= input.charAt(i) && input.charAt(i) <= '9';
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/baseball/view/GameMessage.java b/src/main/java/baseball/view/GameMessage.java
new file mode 100644
index 00000000..8d3d04b4
--- /dev/null
+++ b/src/main/java/baseball/view/GameMessage.java
@@ -0,0 +1,22 @@
+package baseball.view;
+
+public class GameMessage {
+    public void printScoreMessage(int ball, int strike) {
+        if (ball == 0 && strike == 0) {
+            System.out.println("낫싱");
+        }
+        if (ball == 0 && strike != 0) {
+            System.out.println(strike + "스트라이크");
+        }
+        if (ball != 0 && strike == 0) {
+            System.out.println(ball + "볼");
+        }
+        if (ball != 0 && strike != 0) {
+            System.out.println(ball + "볼 " + strike + "스트라이크");
+        }
+    }
+
+    public static void printGameOverMessage() {
+        System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+    }
+}
diff --git a/src/main/java/baseball/view/RequestInput.java b/src/main/java/baseball/view/RequestInput.java
new file mode 100644
index 00000000..8f045055
--- /dev/null
+++ b/src/main/java/baseball/view/RequestInput.java
@@ -0,0 +1,12 @@
+package baseball.view;
+
+public class RequestInput {
+
+    public static void requestInputData() {
+        System.out.print("숫자를 입력해 주세요 : ");
+    }
+
+    public static void printRetryMessage() {
+        System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/baseball/ApplicationTest.java b/src/test/java/baseball/ApplicationTest.java
new file mode 100644
index 00000000..2bf30f75
--- /dev/null
+++ b/src/test/java/baseball/ApplicationTest.java
@@ -0,0 +1,48 @@
+package baseball;
+
+import baseball.view.GameMessage;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+public class ApplicationTest {
+
+    private final PrintStream standardOut = System.out;
+    private final ByteArrayOutputStream outputStreamCaptor = new ByteArrayOutputStream();
+
+    @BeforeEach
+    public void setUp() {
+        System.setOut(new PrintStream(outputStreamCaptor));
+    }
+
+    @AfterEach
+    public void tearDown() {
+        System.setOut(standardOut);
+    }
+
+    @Test
+    public void testPrintScoreMessage() {
+        GameMessage gameMessage = new GameMessage();
+        gameMessage.printScoreMessage(0, 0);
+        assertTrue(outputStreamCaptor.toString().trim().equals("낫싱"));
+
+        outputStreamCaptor.reset(); // 스트림 초기화
+
+        gameMessage.printScoreMessage(1, 2);
+        assertTrue(outputStreamCaptor.toString().trim().equals("1볼 2스트라이크"));
+    }
+
+    @Test
+    public void testPrintGameOverMessage() {
+        GameMessage.printGameOverMessage();
+        assertTrue(outputStreamCaptor.toString().trim().equals("3개의 숫자를 모두 맞히셨습니다! 게임 종료"));
+    }
+
+    // RequestInput에 대한 테스트는 복잡성으로 인해 여기서 다루지 않습니다.
+    // 일반적으로 표준 입력을 직접 다루는 것은 테스트에서 권장되지 않습니다.
+}
diff --git a/src/test/java/baseball/utils/GenerateRandomNumTest.java b/src/test/java/baseball/utils/GenerateRandomNumTest.java
new file mode 100644
index 00000000..64a1d7df
--- /dev/null
+++ b/src/test/java/baseball/utils/GenerateRandomNumTest.java
@@ -0,0 +1,22 @@
+package baseball.utils;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class GenerateRandomNumTest {
+
+    @Test
+    @DisplayName("랜덤 숫자 생성 테스트")
+    void testGetRandomNumbers() {
+        int size = 3;
+        int[] numbers = GenerateRandomNum.getRandomNumbers(size, 1, 9);
+
+        assertEquals(size, numbers.length);
+        assertTrue(numbers[0] != numbers[1]);
+        assertTrue(numbers[1] != numbers[2]);
+        assertTrue(numbers[0] != numbers[2]);
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/baseball/utils/ParseTest.java b/src/test/java/baseball/utils/ParseTest.java
new file mode 100644
index 00000000..d6d07dec
--- /dev/null
+++ b/src/test/java/baseball/utils/ParseTest.java
@@ -0,0 +1,28 @@
+package baseball.utils;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+
+class ParseTest {
+
+    @Test
+    void parseUserInputInvalidLength() {
+        // 길이가 유효하지 않을 때 IllegalArgumentException을 던져야 합니다.
+        Parse parse = new Parse();
+        assertThrows(IllegalArgumentException.class, () -> parse.parseUserInput("12345", 3));
+    }
+
+    @Test
+    void parseUserInputNonDigit() {
+        // 입력에 숫자가 아닌 문자가 포함되어 있을 때 IllegalArgumentException을 던져야 합니다.
+        Parse parse = new Parse();
+        assertThrows(IllegalArgumentException.class, () -> parse.parseUserInput("12a4", 4));
+    }
+
+    @Test
+    void parseUserInputValid() {
+        // 정상적인 입력을 처리할 수 있어야 합니다.
+        Parse parse = new Parse();
+        assertArrayEquals(new int[]{1, 2, 3}, parse.parseUserInput("123", 3));
+    }
+}
diff --git a/src/test/java/baseball/view/GameMessageTest.java b/src/test/java/baseball/view/GameMessageTest.java
new file mode 100644
index 00000000..e0818c54
--- /dev/null
+++ b/src/test/java/baseball/view/GameMessageTest.java
@@ -0,0 +1,60 @@
+package baseball.view;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GameMessageTest {
+
+    private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+    private final PrintStream originalOut = System.out;
+
+    @BeforeEach
+    public void setUpStreams() {
+        System.setOut(new PrintStream(outContent));
+    }
+
+    @AfterEach
+    public void restoreStreams() {
+        System.setOut(originalOut);
+    }
+
+    @Test
+    public void testPrintScoreMessageNothing() {
+        GameMessage gameMessage = new GameMessage();
+        gameMessage.printScoreMessage(0, 0);
+        assertEquals("낫싱\n", outContent.toString());
+    }
+
+    @Test
+    public void testPrintScoreMessageOnlyStrikes() {
+        GameMessage gameMessage = new GameMessage();
+        gameMessage.printScoreMessage(0, 3);
+        assertEquals("3스트라이크\n", outContent.toString());
+    }
+
+    @Test
+    public void testPrintScoreMessageOnlyBalls() {
+        GameMessage gameMessage = new GameMessage();
+        gameMessage.printScoreMessage(2, 0);
+        assertEquals("2볼\n", outContent.toString());
+    }
+
+    @Test
+    public void testPrintScoreMessageBallsAndStrikes() {
+        GameMessage gameMessage = new GameMessage();
+        gameMessage.printScoreMessage(1, 2);
+        assertEquals("1볼 2스트라이크\n", outContent.toString());
+    }
+
+    @Test
+    public void testPrintGameOverMessage() {
+        GameMessage.printGameOverMessage();
+        assertEquals("3개의 숫자를 모두 맞히셨습니다! 게임 종료\n", outContent.toString());
+    }
+}