diff --git a/src/main/java/leets/land/UpdownApplication.java b/src/main/java/leets/land/UpdownApplication.java
index 09d7ae5..8cf0d34 100644
--- a/src/main/java/leets/land/UpdownApplication.java
+++ b/src/main/java/leets/land/UpdownApplication.java
@@ -1,8 +1,97 @@
 package leets.land;
 
+import java.util.Random;
+import java.util.Scanner;
+
 public class UpdownApplication {
 
 	public static void main(String[] args) {
-		System.out.print("hihi :D");
+		Scanner scanner=new Scanner(System.in);
+		System.out.println("숫자 버전(1)과 영어 버전(2) 중 선택해주세요:");
+		int version;
+		do{
+			version=scanner.nextInt();
+			switch(version){
+				case 1:
+					numVersion(scanner);
+					break;
+				case 2:
+					engVersion(scanner);
+					break;
+				default:
+					System.out.println("[ERROR] 존재하지 않는 버전입니다.");
+			}
+		}while(version!=1&&version!=2);
+		scanner.close();
+	}
+	public static void numVersion(Scanner x) {
+		Random random = new Random();
+		int answer = random.nextInt(100) + 1;
+		int number;
+		int tried = 0;
+		int tryMin = 1;
+		int tryMax = 100;
+		Scanner scanner = new Scanner(System.in);
+		System.out.println("1부터 100 사이의 숫자를 맞춰보세요.");
+		System.out.println("숫자를 입력해주세요(1~100):");
+		do {
+			while (!scanner.hasNextInt()) {
+				System.out.println("[ERROR] 존재하지 않는 버전입니다.");
+				scanner.next(); // 버퍼에서 입력 제거
+			}
+			number = scanner.nextInt();
+			if (number < tryMin || number > tryMax ) {
+				System.out.println("[ERROR] 범위 내의 숫자를 입력하세요.");
+				continue;
+			}
+			tried++;
+			if (number < answer) {
+				System.out.println("UP");
+				tryMin = Math.max(tryMin, number + 1);
+				System.out.println("숫자를 입력해주세요("+tryMin+"~"  +tryMax+"): " );
+			} else if (number > answer) {
+				System.out.println("DOWN");
+				tryMax = Math.min(tryMax, number - 1);
+				System.out.println("숫자를 입력해주세요("+tryMin+"~"  +tryMax+"): " );
+			} else {
+				System.out.println("정답!");
+				System.out.println("시도한 횟수:" + tried);
+			}
+		} while (number != answer);
+		scanner.close();
+	}
+	public static void engVersion(Scanner y){
+		Random random=new Random();
+		char answer= (char)(random.nextInt(26)+'A');
+		char english;
+		int tried=0;
+		char tryMin='A';
+		char tryMax='z';
+		Scanner scanner=new Scanner(System.in);
+		System.out.println("영어를 입력해주세요(A ~ z) : ");
+		do{
+			english=scanner.next().charAt(0);
+			if ((english < 'A' || english > 'Z') && (english < 'a' || english > 'z')) {
+				System.out.println("[ERROR] 범위 내의 알파벳을 입력하세요.");
+				System.out.println("영어를 입력해주세요("+tryMin+ "~" +tryMax+")");
+				continue;
+			}
+			tried++;
+			if(english<answer){
+				System.out.println("UP");
+				tryMin=(char)Math.max(tryMin,(char)(english+1));
+				System.out.println("영어를 입력해주세요("+tryMin+ "~" +tryMax+")");
+			}
+			else if(english>answer){
+				System.out.println("DOWN");
+				tryMax=(char)Math.min(tryMax,(char)(english-1));
+				System.out.println("영어를 입력해주세요("+tryMin+ "~" +tryMax+")");
+			}
+			else{
+				System.out.println("정답!");
+				System.out.println("시도한 횟수:"+tried);
+			}
+		}while(english!=answer);
+		scanner.close();
 	}
-}
+}
\ No newline at end of file