diff --git "a/leetcode3/\354\235\264\354\247\204\355\235\254/374. Guess Number Higher or Lower.java" "b/leetcode3/\354\235\264\354\247\204\355\235\254/374. Guess Number Higher or Lower.java"
new file mode 100644
index 00000000..72bf0aa4
--- /dev/null
+++ "b/leetcode3/\354\235\264\354\247\204\355\235\254/374. Guess Number Higher or Lower.java"	
@@ -0,0 +1,22 @@
+public class Solution extends GuessGame {
+    public int guessNumber(int n) {
+        int l = 1;
+        int r = n;
+
+        while (l <= r) {
+
+            int mid = l + (r - l) / 2;
+            int num = guess(mid);
+
+            if (num == -1) {
+                r = mid - 1;
+            } else if (num == 1) {
+                l = mid + 1;
+            } else {
+                return mid;
+            }
+        }
+
+        return -1;
+    }
+}
\ No newline at end of file