diff --git a/README.md b/README.md
index 8d7e8aee..4c3efd6c 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,17 @@
-# java-baseball-precourse
\ No newline at end of file
+# java-baseball-precourse
+
+## 1. View
+1. 정답 추측: "숫자를 입력해주세요" 문구 출력 후 사용자 입력 받는 기능
+2. 힌트: 입력받은 결과를 처리하여 힌트를 출력하는 기능
+3. 게임 클리어: 클리어 문구 출력 후 다시하기 여부를 입력받는 기능
+
+## 2. Validator
+1. 추측 검증: 추측 정보를 검증하는 기능
+2. 다시하기 검증: 다시 시작 정보를 검증하는 기능
+
+## 3. GameService
+1. 무작위 정답 숫자를 생성하는 새 게임 기능
+2. 입력과 정답을 비교하여 결과를 반환하는 기능
+
+## 4. Game
+1. 실행: 위 기능들을 사용하여 게임의 전체적인 흐름을 관리하고 게임을 진행하는 기능
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diff --git a/src/main/java/Application.java b/src/main/java/Application.java
new file mode 100644
index 00000000..bc9cae67
--- /dev/null
+++ b/src/main/java/Application.java
@@ -0,0 +1,6 @@
+public class Application {
+
+    public static void main(String[] args) {
+        Game.start();
+    }
+}
diff --git a/src/main/java/Game.java b/src/main/java/Game.java
new file mode 100644
index 00000000..bf74c05f
--- /dev/null
+++ b/src/main/java/Game.java
@@ -0,0 +1,49 @@
+import java.util.InputMismatchException;
+
+public class Game {
+
+    public static void start() {
+        Game game = new Game();
+        boolean flag = true;
+
+        while (flag) {
+            flag = game.play();
+        }
+
+    }
+
+    int answer;
+
+    public boolean play() {
+        answer = GameService.getNewAnswer();
+        int guess = 0;
+
+        while (answer != guess) {
+            try {
+                guess = View.guessView();
+            } catch (InputMismatchException e) {
+                throw new IllegalArgumentException("숫자를 입력해야합니다.");
+            } catch (Exception e) {
+                throw new IllegalArgumentException();
+            }
+
+            Validator.validateGuess(guess);
+            ResultDto resultDto = GameService.getResult(answer, guess);
+
+            View.hintView(resultDto);
+        }
+
+        int input;
+        try {
+            input = View.successView();
+        } catch (InputMismatchException e) {
+            throw new IllegalArgumentException("숫자를 입력해야 합니다.");
+        } catch (Exception e) {
+            throw new IllegalArgumentException();
+        }
+        Validator.validateReGame(input);
+
+        return input == 1;
+    }
+
+}
diff --git a/src/main/java/GameService.java b/src/main/java/GameService.java
new file mode 100644
index 00000000..5a422b62
--- /dev/null
+++ b/src/main/java/GameService.java
@@ -0,0 +1,40 @@
+import java.util.Random;
+
+public class GameService {
+
+    private GameService() {
+    }
+
+    public static int getNewAnswer() {
+        Random rand = new Random();
+        int num1 = rand.nextInt(9) + 1;
+        int num2 = rand.nextInt(9) + 1;
+        while (num1 == num2) {
+            num2 = rand.nextInt(9) + 1;
+        }
+        int num3 = rand.nextInt(9) + 1;
+        while (num3 == num1 || num3 == num2) {
+            num3 = rand.nextInt(9) + 1;
+        }
+
+        return num1 * 100 + num2 * 10 + num3;
+    }
+
+    public static ResultDto getResult(int answer, int guess) {
+        int strike = 0;
+        int ball = 0;
+        int[] answerArr = {answer / 100, (answer % 100) / 10, answer % 10};
+        int[] guessArr = {guess / 100, (guess % 100) / 10, guess % 10};
+
+        for (int i = 0; i < 3; i++) {
+            if (answerArr[i] == guessArr[i]) {
+                strike++;
+            } else if (guessArr[i] == answerArr[(i + 1) % 3] || guessArr[i] == answerArr[(i + 2)
+                % 3]) {
+                ball++;
+            }
+        }
+
+        return new ResultDto(strike, ball);
+    }
+}
diff --git a/src/main/java/ResultDto.java b/src/main/java/ResultDto.java
new file mode 100644
index 00000000..058de924
--- /dev/null
+++ b/src/main/java/ResultDto.java
@@ -0,0 +1,19 @@
+public class ResultDto {
+
+    private final int strike;
+    private final int ball;
+
+    public ResultDto(int strike, int ball) {
+        this.strike = strike;
+        this.ball = ball;
+    }
+
+
+    public int getStrike() {
+        return strike;
+    }
+
+    public int getBall() {
+        return ball;
+    }
+}
diff --git a/src/main/java/Validator.java b/src/main/java/Validator.java
new file mode 100644
index 00000000..0f9eefc5
--- /dev/null
+++ b/src/main/java/Validator.java
@@ -0,0 +1,20 @@
+public class Validator {
+
+    private Validator() {}
+
+    public static void validateGuess(int num) {
+        if (num <= 100 || num >= 1000) {
+            throw new IllegalArgumentException("3자리 숫자를 입력해야 합니다.");
+        } else if (num/100 == (num%100)/10 || num/100 == num%10 || (num%100)/10 == num%10) {
+            throw new IllegalArgumentException("서로 다른 세 숫자를 입력해야 합니다.");
+        } else if ((num%100)/10 == 0 || num%10 == 0) {
+            throw new IllegalArgumentException("1부터 9까지의 숫자만 입력해야 합니다.");
+        }
+    }
+
+    public static void validateReGame(int num) {
+        if (num != 1 && num != 2) {
+            throw new IllegalArgumentException("1 또는 2를 입력해야 합니다.");
+        }
+    }
+}
diff --git a/src/main/java/View.java b/src/main/java/View.java
new file mode 100644
index 00000000..a9aed36b
--- /dev/null
+++ b/src/main/java/View.java
@@ -0,0 +1,43 @@
+import java.io.InputStream;
+import java.util.Scanner;
+
+public class View {
+
+    private static Scanner sc = new Scanner(System.in);
+
+    private View() {}
+
+    public static int guessView() {
+        System.out.print("숫자를 입력해 주세요 : ");
+        int num = Integer.parseInt(sc.nextLine());
+        return num;
+    }
+
+    public static void hintView(ResultDto resultDto) {
+        int strike = resultDto.getStrike();
+        int ball = resultDto.getBall();
+
+        if (strike == 0 && ball == 0) {
+            System.out.println("낫싱");
+        } else if (strike == 0) {
+            System.out.println(ball + "볼");
+        } else if (ball == 0) {
+            System.out.println(strike + "스트라이크");
+        } else {
+            System.out.println(ball + "볼 " + strike + "스트라이크");
+        }
+    }
+
+    public static int successView() {
+        System.out.println("3개의 숫자를 모두 맞히셨습니다! 게임 종료");
+        System.out.println("게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.");
+        int num = Integer.parseInt(sc.nextLine());
+        return num;
+    }
+
+    public static void resetScanner(InputStream inputStream) {
+        sc.close();
+        sc = new Scanner(inputStream);
+    }
+
+}
diff --git a/src/test/java/GameServiceTest.java b/src/test/java/GameServiceTest.java
new file mode 100644
index 00000000..6bea4371
--- /dev/null
+++ b/src/test/java/GameServiceTest.java
@@ -0,0 +1,22 @@
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class GameServiceTest {
+
+    @Test
+    void getNewAnswer() {
+        int answer = GameService.getNewAnswer();
+        Assertions.assertThatCode(() -> Validator.validateGuess(answer)).doesNotThrowAnyException();
+    }
+
+    @Test
+    void getResult() {
+        int answer = 123;
+        int guess = 135;
+
+        ResultDto resultDto = GameService.getResult(answer, guess);
+
+        Assertions.assertThat(resultDto.getBall()).isEqualTo(1);
+        Assertions.assertThat(resultDto.getStrike()).isEqualTo(1);
+    }
+}
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diff --git a/src/test/java/ValidatorTest.java b/src/test/java/ValidatorTest.java
new file mode 100644
index 00000000..5e951faf
--- /dev/null
+++ b/src/test/java/ValidatorTest.java
@@ -0,0 +1,39 @@
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class ValidatorTest {
+
+    @Test
+    void validateGuessSuccess() {
+        int guess = 123;
+        Assertions.assertThatCode(() -> Validator.validateGuess(guess)).doesNotThrowAnyException();
+    }
+
+    @Test
+    void validateGuessTwoDigit() {
+        int guess = 13;
+        Assertions.assertThatThrownBy(() -> Validator.validateGuess(guess))
+            .isInstanceOf(IllegalArgumentException.class);
+    }
+
+    @Test
+    void validateGuessSameDigit() {
+        int guess = 112;
+        Assertions.assertThatThrownBy(() -> Validator.validateGuess(guess))
+            .isInstanceOf(IllegalArgumentException.class);
+    }
+
+
+    @Test
+    void validateReGameSucess() {
+        int num = 1;
+        Assertions.assertThatCode(() -> Validator.validateReGame(num)).doesNotThrowAnyException();
+    }
+
+    @Test
+    void validateReGameFail() {
+        int num = 3;
+        Assertions.assertThatThrownBy(() -> Validator.validateReGame(num))
+            .isInstanceOf(IllegalArgumentException.class);
+    }
+}
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diff --git a/src/test/java/ViewTest.java b/src/test/java/ViewTest.java
new file mode 100644
index 00000000..6cf3e0c3
--- /dev/null
+++ b/src/test/java/ViewTest.java
@@ -0,0 +1,76 @@
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class ViewTest {
+
+    OutputStream out;
+
+    @BeforeEach
+    void beforeEach() {
+        out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+    }
+
+    @Test
+    void guessView() {
+        InputStream in = new ByteArrayInputStream("123\n".getBytes());
+        View.resetScanner(in);
+
+        int num1 = View.guessView();
+
+        Assertions.assertThat(num1).isEqualTo(123);
+    }
+
+    @Test
+    void hintViewNothing() {
+        ResultDto resultDto = new ResultDto(0, 0);
+
+        View.hintView(resultDto);
+
+        Assertions.assertThat(out.toString().trim()).isEqualTo("낫싱");
+    }
+
+    @Test
+    void hintViewStrike() {
+        ResultDto resultDto = new ResultDto(2, 0);
+
+        View.hintView(resultDto);
+
+        Assertions.assertThat(out.toString().trim()).isEqualTo("2스트라이크");
+    }
+
+    @Test
+    void hintViewBall() {
+        ResultDto resultDto = new ResultDto(0, 3);
+
+        View.hintView(resultDto);
+
+        Assertions.assertThat(out.toString().trim()).isEqualTo("3볼");
+    }
+
+    @Test
+    void hintViewBoth() {
+        ResultDto resultDto = new ResultDto(1, 1);
+
+        View.hintView(resultDto);
+
+        Assertions.assertThat(out.toString().trim()).isEqualTo("1볼 1스트라이크");
+    }
+
+    @Test
+    void successView() {
+        InputStream in = new ByteArrayInputStream("1\n".getBytes());
+        View.resetScanner(in);
+
+        int num1 = View.guessView();
+
+        Assertions.assertThat(num1).isEqualTo(1);
+    }
+}
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