diff --git a/LeetCode/GuessingGame.cpp b/LeetCode/GuessingGame.cpp
new file mode 100644
index 00000000..c53b52a8
--- /dev/null
+++ b/LeetCode/GuessingGame.cpp
@@ -0,0 +1,28 @@
+class Solution {
+public:
+    int guessNumber(int n) {
+        
+        // -1 mtlb num > target 
+        // 1 num < target
+        int mid =0;
+        
+        int s = 0;
+        int e = n;
+        while(s<=e){
+            int mid = s+(e-s)/2;
+            if(guess(mid)==0){
+                return mid;
+            }
+            else if(guess(mid)== -1){
+                e = mid-1;
+            }
+            else{
+                
+                s = mid+1;
+            }
+        }
+        
+        return -1;
+    
+    }
+};
\ No newline at end of file