diff --git a/README.md b/README.md
index 8d7e8aee..7b0fc39e 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,30 @@
-# java-baseball-precourse
\ No newline at end of file
+# java-baseball-precourse
+
+### 기능 요구사항 목록
+
+- [x] 컴퓨터가 1에서 9까지 서로 다른 임의의 수 3개를 선택
+- [x] 사용자에게 수 입력받기
+- [x] 입력받은 수와 비교하여 힌트 생성
+  - [x] 스트라이크 : 같은 수가 같은 자리에 있을 때
+  - [x] 볼 : 같은 수가 다른 자리에 있을 때
+  - [x] 낫싱 : 같은 수가 전혀 없을 때
+- [x] 힌트 출력하기
+- [x] 사용자가 잘못된 값을 입력한 경우 `IllegalArgumentException` 발생시키기
+  - [x] 게임 종료후, 재시작을 물어볼 때 1, 2 외에 잘못한 값을 입력했을 때
+  - [x] 게임 중, 세자리 숫자를 잘못 입력 했을 때
+- [x] 사용자가 수를 맞췄을 때, 게임을 다시 할 건지 물어보기
+
+### 테스트 목록
+
+- [x] 랜덤 3자리수를 생성하는지 확인
+  - [x] 3자리 숫자를 생성하는지 확인
+  - [x] 중복이 없는 숫자를 생성하는지 확인
+- [x] 사용자가 잘못된 값을 입력한 경우 Validation Class 에서 검증 되는지 확인
+  - [x] 숫자가 아닌 값을 입력했을 때
+  - [x] 3자리가 아닌 숫자를 입력했을 때
+  - [x] 같은 숫자 여러개를 입력했을 때
+  - [x] 종료할 때, 1과 2 외에 다른 값을 입력했을 때
+- [x] strike와 ball에 따라 적절한 Hint String을 반환하는지 확인
+  - [x] 스트라이크
+  - [x] 볼
+  - [x] 낫싱  
diff --git a/src/main/java/Application.java b/src/main/java/Application.java
new file mode 100644
index 00000000..48e807aa
--- /dev/null
+++ b/src/main/java/Application.java
@@ -0,0 +1,7 @@
+public class Application {
+
+    public static void main(String[] args) {
+        Game game = new Game();
+        game.run();
+    }
+}
diff --git a/src/main/java/Game.java b/src/main/java/Game.java
new file mode 100644
index 00000000..faa43407
--- /dev/null
+++ b/src/main/java/Game.java
@@ -0,0 +1,75 @@
+import constant.GameConstant;
+import constant.GameMessageConstant;
+import data.GameResult;
+import java.util.Scanner;
+
+public class Game {
+
+    Player computer;
+    boolean isEnd;
+
+    public void run() throws IllegalArgumentException {
+        Scanner scanner = new Scanner(System.in);
+        String inputCommand;
+        do {
+            game();
+            System.out.println(GameMessageConstant.GAME_RESTART_QUESTION);
+            inputCommand = scanner.next();
+            if (!Validation.checkEndCommand(inputCommand)) {
+                throw new IllegalArgumentException();
+            }
+        } while (Integer.parseInt(inputCommand) != GameConstant.END_GAME_NUMBER);
+        System.out.println(GameMessageConstant.GAME_END);
+    }
+
+    public void init() {
+        computer = new Player();
+        isEnd = false;
+    }
+
+    public void game() throws IllegalArgumentException {
+        init();
+        System.out.println(GameMessageConstant.START_GAME);
+        Scanner scanner = new Scanner(System.in);
+        String inputNumber;
+        GameResult result;
+        Hint hint;
+        do {
+            System.out.print(GameMessageConstant.INPUT_NUMBER);
+            inputNumber = scanner.next();
+            checkInputNumber(inputNumber);
+            result = getResult(inputNumber);
+            hint = new Hint(result);
+            System.out.println(hint.getHint());
+        } while (!isEnd);
+        System.out.println(GameMessageConstant.GAME_CLEAR);
+    }
+
+    private GameResult getResult(String inputNumber) {
+        GameResult result = computer.checkMatching(input2IntArray(inputNumber));
+        checkEnd(result);
+        return result;
+    }
+
+    private void checkInputNumber(String inputNumber) throws IllegalArgumentException {
+        if (!Validation.checkThreeDigitNumber(inputNumber) || !Validation.checkDuplicateNumber(
+                inputNumber)) {
+            throw new IllegalArgumentException();
+        }
+    }
+
+    private void checkEnd(GameResult result) {
+        if (result.strike() == GameConstant.NUMBER_COUNT) {
+            isEnd = true;
+        }
+    }
+
+    private int[] input2IntArray(String inputNumber) {
+        int[] guess = new int[GameConstant.NUMBER_COUNT];
+        for (int i = 0; i < GameConstant.NUMBER_COUNT; i++) {
+            guess[i] = Character.getNumericValue(inputNumber.charAt(i));
+        }
+        return guess;
+    }
+
+}
diff --git a/src/main/java/Hint.java b/src/main/java/Hint.java
new file mode 100644
index 00000000..e8ff97a1
--- /dev/null
+++ b/src/main/java/Hint.java
@@ -0,0 +1,38 @@
+import constant.GameMessageConstant;
+import data.GameResult;
+
+public class Hint {
+
+    GameResult result;
+
+    public Hint(GameResult result) {
+        this.result = result;
+    }
+
+    public String getHint() {
+        if (result.ball() == 0 && result.strike() == 0) {
+            return GameMessageConstant.NOTHING;
+        }
+        if (result.ball() == 0) {
+            return strike2String(result.strike());
+        }
+        if (result.strike() == 0) {
+            return ball2String(result.ball());
+        }
+        return ball2String(result.ball()) + " " + strike2String(result.strike());
+    }
+
+    private String ball2String(int ball) {
+        if (ball > 0) {
+            return String.format("%d%s", ball, GameMessageConstant.BALL);
+        }
+        return "";
+    }
+
+    private String strike2String(int strike) {
+        if (strike > 0) {
+            return String.format("%d%s", strike, GameMessageConstant.STRIKE);
+        }
+        return "";
+    }
+}
diff --git a/src/main/java/Player.java b/src/main/java/Player.java
new file mode 100644
index 00000000..337c6f13
--- /dev/null
+++ b/src/main/java/Player.java
@@ -0,0 +1,50 @@
+import constant.GameConstant;
+import data.GameResult;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Player {
+
+    private int[] answer = new int[GameConstant.NUMBER_COUNT];
+    Set<Integer> numbers = new HashSet<>();
+
+    public Player() {
+        createRandomAnswer();
+    }
+
+    private void createRandomAnswer() {
+        answer = RandomNumberGenerator.generate(GameConstant.NUMBER_COUNT);
+        for (int i = 0; i < GameConstant.NUMBER_COUNT; i++) {
+            numbers.add(answer[i]);
+        }
+    }
+
+    public GameResult checkMatching(int[] guess) {
+        int ball = checkBall(guess);
+        int strike = checkStrike(guess);
+        return new GameResult(ball, strike);
+    }
+
+    private int checkBall(int[] guess) {
+        int count = 0;
+        for (int i = 0; i < GameConstant.NUMBER_COUNT; i++) {
+            if (answer[i] == guess[i]) {
+                continue;
+            }
+            if (numbers.contains(guess[i])) {
+                count++;
+            }
+        }
+        return count;
+    }
+
+    private int checkStrike(int[] guess) {
+        int count = 0;
+        for (int i = 0; i < GameConstant.NUMBER_COUNT; i++) {
+            if (answer[i] == guess[i]) {
+                count++;
+            }
+        }
+        return count;
+    }
+}
diff --git a/src/main/java/RandomNumberGenerator.java b/src/main/java/RandomNumberGenerator.java
new file mode 100644
index 00000000..8423f873
--- /dev/null
+++ b/src/main/java/RandomNumberGenerator.java
@@ -0,0 +1,25 @@
+import java.util.HashSet;
+import java.util.Random;
+import java.util.Set;
+
+public class RandomNumberGenerator {
+
+    public static int[] generate(int length) {
+        int[] result = new int[length];
+        Set<Integer> numbers = new HashSet<>();
+        while (numbers.size() < length) {
+            int number = createRandomNumber();
+            numbers.add(number);
+        }
+        int index = 0;
+        for (int number : numbers) {
+            result[index++] = number;
+        }
+        return result;
+    }
+
+    private static int createRandomNumber() {
+        Random random = new Random();
+        return random.nextInt(10);
+    }
+}
diff --git a/src/main/java/Validation.java b/src/main/java/Validation.java
new file mode 100644
index 00000000..8439ffe1
--- /dev/null
+++ b/src/main/java/Validation.java
@@ -0,0 +1,31 @@
+import constant.GameConstant;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+public final class Validation {
+
+    static final String TREE_DIGIT_REGEX = "^[0-9]{3}$";
+    static final String ONE_DIGIT_REGEX = "^[0-9]{1}$";
+
+    public static boolean checkThreeDigitNumber(String inputNumber) {
+        return Pattern.compile(TREE_DIGIT_REGEX).matcher(inputNumber).matches();
+    }
+
+    public static boolean checkDuplicateNumber(String inputNumber) {
+        Set<Character> chars = new HashSet<>();
+        for (char c : inputNumber.toCharArray()) {
+            chars.add(c);
+        }
+        return chars.size() == GameConstant.NUMBER_COUNT;
+    }
+
+    public static boolean checkEndCommand(String inputCommand) {
+        if (!Pattern.compile(ONE_DIGIT_REGEX).matcher(inputCommand).matches()) {
+            return false;
+        }
+        int command = Integer.parseInt(inputCommand);
+        return command == GameConstant.END_GAME_NUMBER
+                || command == GameConstant.RESTART_GAME_NUMBER;
+    }
+}
diff --git a/src/main/java/constant/GameConstant.java b/src/main/java/constant/GameConstant.java
new file mode 100644
index 00000000..38b95b3a
--- /dev/null
+++ b/src/main/java/constant/GameConstant.java
@@ -0,0 +1,8 @@
+package constant;
+
+public final class GameConstant {
+
+    public static final int NUMBER_COUNT = 3;
+    public static final int RESTART_GAME_NUMBER = 1;
+    public static final int END_GAME_NUMBER = 2;
+}
diff --git a/src/main/java/constant/GameMessageConstant.java b/src/main/java/constant/GameMessageConstant.java
new file mode 100644
index 00000000..10ee1169
--- /dev/null
+++ b/src/main/java/constant/GameMessageConstant.java
@@ -0,0 +1,16 @@
+package constant;
+
+public final class GameMessageConstant {
+
+    public static final String BALL = "볼";
+    public static final String STRIKE = "스트라이크";
+    public static final String NOTHING = "낫싱";
+    public static final String START_GAME = "숫자 야구 게임을 시작합니다. 제가 생각한 숫자를 맞춰보세요!\n";
+    public static final String INPUT_NUMBER = "숫자를 입력해주세요 : ";
+    public static final String GAME_CLEAR = String.format("%d개의 숫자를 정확히 맞히셨습니다! 축하드립니다.",
+            GameConstant.NUMBER_COUNT);
+    public static final String GAME_RESTART_QUESTION = String.format(
+            "게임을 새로 시작하려면 %d, 종료하려면 %d를 입력하세요.",
+            GameConstant.RESTART_GAME_NUMBER, GameConstant.END_GAME_NUMBER);
+    public static final String GAME_END = "게임을 종료합니다.";
+}
diff --git a/src/main/java/data/GameResult.java b/src/main/java/data/GameResult.java
new file mode 100644
index 00000000..00c125fa
--- /dev/null
+++ b/src/main/java/data/GameResult.java
@@ -0,0 +1,5 @@
+package data;
+
+public record GameResult(int ball, int strike) {
+
+}
\ No newline at end of file
diff --git a/src/test/java/HintTest.java b/src/test/java/HintTest.java
new file mode 100644
index 00000000..03842eb6
--- /dev/null
+++ b/src/test/java/HintTest.java
@@ -0,0 +1,38 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import constant.GameMessageConstant;
+import data.GameResult;
+import org.junit.jupiter.api.Test;
+
+class HintTest {
+
+    @Test
+    void getHint_nothing() {
+        Hint hint = new Hint(new GameResult(0, 0));
+        assertEquals(hint.getHint(), GameMessageConstant.NOTHING);
+    }
+
+    @Test
+    void getHint_onlyBall() {
+        int ball = 1;
+        Hint hint = new Hint(new GameResult(ball, 0));
+        assertEquals(hint.getHint(), String.format("%d%s", ball, GameMessageConstant.BALL));
+    }
+
+    @Test
+    void getHint_onlyStrike() {
+        int strike = 3;
+        Hint hint = new Hint(new GameResult(0, strike));
+        assertEquals(hint.getHint(), String.format("%d%s", strike, GameMessageConstant.STRIKE));
+    }
+
+    @Test
+    void getHint_ballAndStrike() {
+        int ball = 1;
+        int strike = 1;
+        Hint hint = new Hint(new GameResult(ball, strike));
+        assertEquals(hint.getHint(),
+                String.format("%d%s %d%s", ball, GameMessageConstant.BALL, strike,
+                        GameMessageConstant.STRIKE));
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/RandomNumberGeneratorTest.java b/src/test/java/RandomNumberGeneratorTest.java
new file mode 100644
index 00000000..ac1e204c
--- /dev/null
+++ b/src/test/java/RandomNumberGeneratorTest.java
@@ -0,0 +1,27 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.HashSet;
+import java.util.Set;
+import org.junit.jupiter.api.Test;
+
+class RandomNumberGeneratorTest {
+
+    @Test
+    void generate_lengthCheck_true() {
+        int length = 3;
+        int[] result = RandomNumberGenerator.generate(length);
+        assertEquals(result.length, length);
+    }
+
+    @Test
+    void generate_duplicateCheck_true() {
+        int length = 3;
+        Set<Integer> numbers = new HashSet<>();
+        int[] result = RandomNumberGenerator.generate(length);
+        for (int i : result) {
+            numbers.add(i);
+        }
+        assertEquals(numbers.size(), length);
+    }
+
+}
\ No newline at end of file
diff --git a/src/test/java/ValidationTest.java b/src/test/java/ValidationTest.java
new file mode 100644
index 00000000..6f97df53
--- /dev/null
+++ b/src/test/java/ValidationTest.java
@@ -0,0 +1,53 @@
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+class ValidationTest {
+
+    @Test
+    void checkThreeDigitNumber_rightInput_true() {
+        assertTrue(Validation.checkThreeDigitNumber("136"));
+        assertTrue(Validation.checkThreeDigitNumber("111"));
+    }
+
+    @Test
+    void checkThreeDigitNumber_wrongLengthInput_false() {
+        assertFalse(Validation.checkThreeDigitNumber("14"));
+        assertFalse(Validation.checkThreeDigitNumber(""));
+        assertFalse(Validation.checkThreeDigitNumber("6789"));
+    }
+
+    @Test
+    void checkThreeDigitNumber_notNumberInput_false() {
+        assertFalse(Validation.checkThreeDigitNumber("1a2"));
+        assertFalse(Validation.checkThreeDigitNumber("14*"));
+        assertFalse(Validation.checkThreeDigitNumber("9$0"));
+    }
+
+    @Test
+    void checkDuplicateNumber_rightInput_true() {
+        assertTrue(Validation.checkDuplicateNumber("136"));
+        assertTrue(Validation.checkDuplicateNumber("567"));
+    }
+
+    @Test
+    void checkDuplicateNumber_duplicateInput_false() {
+        assertFalse(Validation.checkDuplicateNumber("118"));
+        assertFalse(Validation.checkDuplicateNumber("399"));
+        assertFalse(Validation.checkDuplicateNumber("080"));
+    }
+
+    @Test
+    void checkEndCommand_rightInput_true() {
+        assertTrue(Validation.checkEndCommand("1"));
+        assertTrue(Validation.checkEndCommand("2"));
+    }
+
+    @Test
+    void checkEndCommand_otherInput_false() {
+        assertFalse(Validation.checkEndCommand("0"));
+        assertFalse(Validation.checkEndCommand("a"));
+        assertFalse(Validation.checkEndCommand("4"));
+    }
+}
\ No newline at end of file