diff --git a/README.md b/README.md
index 8d7e8aee..bd5cd6e5 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,10 @@
-# java-baseball-precourse
\ No newline at end of file
+# java-baseball-precourse
+
+- 기능 요구 사항
+  - 1~9까지 서로 다른 수로 이루어진 3자리 수를 컴퓨터가 제시한다.
+  - 같은 수가 같은 자리에 있으면 스트라이크, 다른 자리에 있으면 볼, 같은 수가 전혀 없으면 낫싱
+  - 컴퓨터가 제시한 3개의 숫자를 플레이어(유저)가 모두 맞히면 게임 종료
+    - 그 전까지는 게임이 지속되어야 함.
+  - 게임을 종료했을 때, 다시 시작하거나 완전히 종료 가능
+  - 플레이어(유저)가 잘못된 값을 입력하면 ```IllegalArgumentException```을 발생시킨 후 애플리케이션 종료
+  
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index 11c425be..b6e65347 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -2,3 +2,5 @@ plugins {
     id 'org.gradle.toolchains.foojay-resolver-convention' version '0.7.0'
 }
 rootProject.name = 'java-baseball'
+include 'baseballModule'
+
diff --git a/src/main/baseball/baseball.java b/src/main/baseball/baseball.java
new file mode 100644
index 00000000..ddfdfd26
--- /dev/null
+++ b/src/main/baseball/baseball.java
@@ -0,0 +1,113 @@
+//package baseball;
+//
+//import java.util.ArrayList;
+//import java.util.List;
+//import java.util.Objects;
+//import java.util.Random;
+//import java.util.Scanner;
+//
+//public class baseball {
+//    public static void main(String[] args) {
+//        System.out.println("숫자 야구 게임을 시작합니다.");
+//        boolean newGame;
+//        do {
+//            newGame = new GameController().playGame();
+//        } while (newGame);
+//    }
+//}
+//
+//class GameController {
+//    public boolean playGame() {
+//        List<Integer> comList = RandomNumberGenerator.generateRandomNumberList();
+//        while (true) {
+//            System.out.print("숫자를 입력해주세요: ");
+//            int ball = 0;
+//            int strike = 0;
+//            int num = InputHandler.getInputNumber();
+//            checkValid(num);
+//            List<Integer> myList = NumberUtil.getInts(num);
+//            for (int i = 0; i < 3; i++) {
+//                if (!Objects.equals(myList.get(i), comList.get(i))) {
+//                    boolean contains = comList.contains(myList.get(i));
+//                    if (contains) {
+//                        ball++;
+//                    }
+//                }
+//                if (Objects.equals(myList.get(i), comList.get(i))) {
+//                    strike++;
+//                }
+//            }
+//            GameOutput.printResult(ball, strike);
+//            if (strike == 3) {
+//                System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+//                return InputHandler.askForNewGame();
+//            }
+//        }
+//    }
+//
+//    private static void checkValid(int num) {
+//        if (num < 100 || num > 999) {
+//            throw new IllegalArgumentException("입력 범위를 초과했습니다.");
+//        }
+//    }
+//}
+//
+//class RandomNumberGenerator {
+//    public static List<Integer> generateRandomNumberList() {
+//        Random random = new Random();
+//        List<Integer> comList = new ArrayList<>();
+//        while (comList.size() < 3) {
+//            int randomNumber = random.nextInt(9) + 1;
+//            if (!comList.contains(randomNumber)) {
+//                comList.add(randomNumber);
+//            }
+//        }
+//        return comList;
+//    }
+//}
+//
+//class InputHandler {
+//    public static int getInputNumber() {
+//        Scanner scanner = new Scanner(System.in);
+//        int number = Integer.parseInt(scanner.nextLine()); // 사용자 입력을 받아 정수로 변환
+//        return number;
+//    }
+//
+//    public static boolean askForNewGame() {
+//        System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+//        int value = getInputNumber();
+//        if (value == 1) {
+//            return true;
+//        } else if (value == 2) {
+//            return false;
+//        } else {
+//            throw new IllegalArgumentException("올바른 입력이 아닙니다.");
+//        }
+//    }
+//}
+//
+//class GameOutput {
+//    public static void printResult(int ball, int strike) {
+//        if (ball == 0 && strike == 0) {
+//            System.out.println("낫싱");
+//        } else {
+//            if (ball != 0) {
+//                System.out.print(ball + "볼 ");
+//            }
+//            if (strike != 0) {
+//                System.out.print(strike + "스트라이크");
+//            }
+//            System.out.println();
+//        }
+//    }
+//}
+//
+//class NumberUtil {
+//    public static List<Integer> getInts(int num) {
+//        List<Integer> myList = new ArrayList<>();
+//        myList.add(num / 100);
+//        myList.add((num / 10) % 10);
+//        myList.add(num % 10);
+//        return myList;
+//    }
+//}
\ No newline at end of file
diff --git a/src/main/java/Application.java b/src/main/java/Application.java
new file mode 100644
index 00000000..15b3125c
--- /dev/null
+++ b/src/main/java/Application.java
@@ -0,0 +1,113 @@
+//package baseball;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.Random;
+import java.util.Scanner;
+
+public class Application {
+    public static void main(String[] args) {
+        System.out.println("숫자 야구 게임을 시작합니다.");
+        boolean newGame;
+        do {
+            newGame = new GameController().playGame();
+        } while (newGame);
+    }
+}
+
+class GameController {
+    public boolean playGame() {
+        List<Integer> comList = RandomNumberGenerator.generateRandomNumberList();
+        while (true) {
+            System.out.print("숫자를 입력해주세요: ");
+            int ball = 0;
+            int strike = 0;
+            int num = InputHandler.getInputNumber();
+            checkValid(num);
+            List<Integer> myList = NumberUtil.getInts(num);
+            for (int i = 0; i < 3; i++) {
+                if (!Objects.equals(myList.get(i), comList.get(i))) {
+                    boolean contains = comList.contains(myList.get(i));
+                    if (contains) {
+                        ball++;
+                    }
+                }
+                if (Objects.equals(myList.get(i), comList.get(i))) {
+                    strike++;
+                }
+            }
+            GameOutput.printResult(ball, strike);
+            if (strike == 3) {
+                System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+                return InputHandler.askForNewGame();
+            }
+        }
+    }
+
+    private static void checkValid(int num) {
+        if (num < 100 || num > 999) {
+            throw new IllegalArgumentException("입력 범위를 초과했습니다.");
+        }
+    }
+}
+
+class RandomNumberGenerator {
+    public static List<Integer> generateRandomNumberList() {
+        Random random = new Random();
+        List<Integer> comList = new ArrayList<>();
+        while (comList.size() < 3) {
+            int randomNumber = random.nextInt(9) + 1;
+            if (!comList.contains(randomNumber)) {
+                comList.add(randomNumber);
+            }
+        }
+        return comList;
+    }
+}
+
+class InputHandler {
+    public static int getInputNumber() {
+        Scanner scanner = new Scanner(System.in);
+        int number = Integer.parseInt(scanner.nextLine()); // 사용자 입력을 받아 정수로 변환
+        return number;
+    }
+
+    public static boolean askForNewGame() {
+        System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+        int value = getInputNumber();
+        if (value == 1) {
+            return true;
+        } else if (value == 2) {
+            return false;
+        } else {
+            throw new IllegalArgumentException("올바른 입력이 아닙니다.");
+        }
+    }
+}
+
+class GameOutput {
+    public static void printResult(int ball, int strike) {
+        if (ball == 0 && strike == 0) {
+            System.out.println("낫싱");
+        } else {
+            if (ball != 0) {
+                System.out.print(ball + "볼 ");
+            }
+            if (strike != 0) {
+                System.out.print(strike + "스트라이크");
+            }
+            System.out.println();
+        }
+    }
+}
+
+class NumberUtil {
+    public static List<Integer> getInts(int num) {
+        List<Integer> myList = new ArrayList<>();
+        myList.add(num / 100);
+        myList.add((num / 10) % 10);
+        myList.add(num % 10);
+        return myList;
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/ApplicationTest.java b/src/test/java/ApplicationTest.java
new file mode 100644
index 00000000..c755c8f6
--- /dev/null
+++ b/src/test/java/ApplicationTest.java
@@ -0,0 +1,17 @@
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.*;
+import java.io.ByteArrayInputStream;
+
+class ApplicationTest {
+
+    @Test
+    void testPlayGameWithInvalidInput() {
+        ByteArrayInputStream in = new ByteArrayInputStream("9999\n".getBytes());
+        System.setIn(in);
+
+        GameController gameController = new GameController();
+        assertThrows(IllegalArgumentException.class, gameController::playGame);
+    }
+
+
+}
\ No newline at end of file