diff --git a/index.html b/index.html
index 041e0300..2259185f 100644
--- a/index.html
+++ b/index.html
@@ -13,10 +13,13 @@ <h1>⚾ 숫자 야구 게임</h1>
         올바른 예) 139 <br />
         틀린 예) 122
       </p>
-      <input type="text" id="user-input" />
-      <button id="submit">확인</button>
+      <form id="form">
+        <input type="number" id="user-input" />
+        <button id="submit">확인</button>
+      </form>
       <h3>📄 결과</h3>
       <div id="result"></div>
+      <button id="game-restart-button" style="display: none">재시작</button>
     </div>
     <script type="module" src="src/index.js"></script>
   </body>
diff --git a/src/index.js b/src/index.js
index 1553d753..344ba9f4 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,13 +1,93 @@
-export default function BaseballGame() {
-  this.play = function (computerInputNumbers, userInputNumbers) {
-    return "결과 값 String";
-  };
-}
-
-// export default class BaseballGame {
-//   play(computerInputNumbers, userInputNumbers) {
-//     return "결과 값 String";
-//   }
-// }
-
-new BaseballGame();
+const generateNumbers = (min = 1, max = 9) => {
+  min = Math.ceil(min);
+  max = Math.floor(max);
+  return Math.floor(Math.random() * (max - min + 1) + min);
+};
+
+const generateWinningNumber = () => {
+  const result = [];
+
+  while (result.length < 3) {
+    const randomNumber = generateNumbers();
+
+    if (result.includes(randomNumber)) {
+      continue;
+    }
+
+    result.push(randomNumber);
+  }
+
+  return result;
+};
+
+const play = (winningNumber, userInputValue) => {
+  const userInputNumber = userInputValue.split("").map(Number);
+
+  let strike = 0;
+  let ball = 0;
+
+  for (let i = 0; i < userInputNumber.length; i++) {
+    if (userInputNumber[i] === winningNumber[i]) {
+      strike++;
+    } else if (winningNumber.includes(userInputNumber[i])) {
+      ball++;
+    }
+  }
+
+  const $result = document.querySelector("#result");
+
+  if (strike === 3) {
+    const $gameRestartButton = document.querySelector("#game-restart-button");
+    $result.textContent =
+      "정답을 맞추셨습니다 🎉 게임을 새로 시작하시겠습니까?";
+    $gameRestartButton.style.display = "block";
+  } else if (strike || ball) {
+    $result.textContent = `${strike} 스트라이크 ${ball} 볼`;
+  } else {
+    $result.textContent = "낫싱";
+  }
+};
+
+const baseballGame = () => {
+  const winningNumber = generateWinningNumber();
+
+  console.log("winningNumber", winningNumber);
+
+  const $input = document.querySelector("#user-input");
+
+  $input.addEventListener("keydown", (e) => {
+    if (e.target.value.length >= 3) {
+      if (e.key === "Enter" || e.key === "Backspace") return;
+
+      e.preventDefault();
+      alert("3자리수 이하의 숫자만 입력해 주세요");
+    }
+  });
+
+  const $form = document.querySelector("#form");
+
+  $form.addEventListener("submit", (event) => {
+    event.preventDefault();
+
+    const userInputValue = event.target[0].value;
+    if (userInputValue.length !== 3) {
+      alert("세자리 숫자를 입력해 주세요");
+      e.preventDefault();
+    }
+
+    play(winningNumber, userInputValue);
+  });
+
+  const $gameRestartButton = document.querySelector("#game-restart-button");
+  $gameRestartButton.addEventListener("click", () => {
+    console.log("리스타트");
+
+    const $result = document.querySelector("#result");
+
+    $result.textContent = "";
+    $gameRestartButton.style.display = "none";
+    baseballGame();
+  });
+};
+
+baseballGame();