diff --git a/docs/README.md b/docs/README.md
new file mode 100644
index 000000000..6c727f39d
--- /dev/null
+++ b/docs/README.md
@@ -0,0 +1,6 @@
+-   ✅랜덤 숫자 세자리 지정하기
+-   ✅사용자 입력받기
+-   ✅컴퓨터 응답 출력하기
+-   ✅잘못된 값 입력 시 에러 발생하기
+-   ✅랜덤 숫자와 사용자 입력 비교하기
+-   ✅게임 종료 시 재시작/종료 입력받기
diff --git a/src/App.js b/src/App.js
index c38b30d5b..52d55ef06 100644
--- a/src/App.js
+++ b/src/App.js
@@ -1,5 +1,14 @@
+import Computer from './Computer.js';
+import User from './User.js';
+
 class App {
-  async play() {}
+  constructor() {
+    this.computer = new Computer();
+    this.user = new User();
+  }
+  async play() {
+    await this.computer.playGame(this.user);
+  }
 }
 
 export default App;
diff --git a/src/Computer.js b/src/Computer.js
new file mode 100644
index 000000000..75c629c39
--- /dev/null
+++ b/src/Computer.js
@@ -0,0 +1,72 @@
+import { MissionUtils } from '@woowacourse/mission-utils';
+
+export default class Computer {
+  static REPLAY_CODE = '1';
+  static QUIT_CODE = '2';
+  static NUM_SIZE = 3;
+  static MODE_SIZE = 1;
+
+  constructor() {
+    this.numbers = [];
+  }
+  pickRandomNumbers() {
+    this.clearNumbers();
+    while (this.numbers.length < Computer.NUM_SIZE) {
+      const number = MissionUtils.Random.pickNumberInRange(1, 9);
+      if (!this.numbers.includes(number)) {
+        this.numbers.push(number);
+      }
+    }
+  }
+  async playGame(user) {
+    MissionUtils.Console.print('숫자 야구 게임을 시작합니다.');
+    while (true) {
+      this.pickRandomNumbers();
+      while (true) {
+        const input = await user.getUserNumber();
+        const result = this.getMessage(input);
+        MissionUtils.Console.print(result.result);
+        if (result.success) {
+          MissionUtils.Console.print(
+            '3개의 숫자를 모두 맞히셨습니다! 게임 종료'
+          );
+          break;
+        }
+      }
+      const input = await user.getUserReplay();
+      if (input === Computer.QUIT_CODE) break;
+    }
+  }
+  getMessage(expectedNumbers) {
+    const ballStrike = this.calculateBallStrike(expectedNumbers);
+    const result = this.getResultString(ballStrike);
+    return {
+      result,
+      success: ballStrike.strike === Computer.NUM_SIZE,
+    };
+  }
+  calculateBallStrike(expectedNumbers) {
+    return expectedNumbers
+      .split('')
+      .map(Number)
+      .reduce(
+        (res, cur, idx) => {
+          const newRes = { ...res };
+          if (this.numbers[idx] === cur) newRes.strike += 1;
+          else if (this.numbers.includes(cur)) newRes.ball += 1;
+          return newRes;
+        },
+        { ball: 0, strike: 0 }
+      );
+  }
+  getResultString({ ball, strike }) {
+    if (ball === 0 && strike === 0) return '낫싱';
+    else if (ball === 0) return `${strike}스트라이크`;
+    else if (strike === 0) return `${ball}볼`;
+    else return `${ball}볼 ${strike}스트라이크`;
+  }
+
+  clearNumbers() {
+    this.numbers = [];
+  }
+}
diff --git a/src/User.js b/src/User.js
new file mode 100644
index 000000000..1ccb824fd
--- /dev/null
+++ b/src/User.js
@@ -0,0 +1,34 @@
+import { MissionUtils } from '@woowacourse/mission-utils';
+import Computer from './Computer';
+export default class User {
+  async getUserNumber() {
+    const input = await MissionUtils.Console.readLineAsync(
+      '숫자를 입력해주세요 : '
+    );
+
+    if (
+      input.length !== Computer.NUM_SIZE ||
+      input.includes('0') ||
+      Number.isNaN(input)
+    ) {
+      throw new Error('[ERROR] 숫자가 잘못된 형식입니다.');
+    }
+
+    return input;
+  }
+
+  async getUserReplay() {
+    const input = await MissionUtils.Console.readLineAsync(
+      '게임을 새로 시작하려면 1, 종료하려면 2를 입력하세요.\n'
+    );
+    if (
+      input.length !== Computer.MODE_SIZE ||
+      (input !== Computer.REPLAY_CODE && input !== Computer.QUIT_CODE) ||
+      Number.isNaN(input)
+    ) {
+      throw new Error('[ERROR] 숫자가 잘못된 형식입니다.');
+    }
+
+    return input;
+  }
+}