diff --git a/guess_number.py b/guess_number.py
index bc76576..c24ec94 100644
--- a/guess_number.py
+++ b/guess_number.py
@@ -1,24 +1,32 @@
 import random
 
 def guess_number():
-    number_to_guess = random.randint(1, 100)  # Random number between 1 and 100
+    print("Welcome to the Number Guessing Game!")
+    lower_bound = int(input("Enter the lower bound of the range: "))
+    upper_bound = int(input("Enter the upper bound of the range: "))
+    
+    number_to_guess = random.randint(lower_bound, upper_bound)  # Random number within user-defined range
     attempts = 0
     guessed = False
 
-    print("Welcome to the Number Guessing Game!")
-    print("I have chosen a number between 1 and 100. Can you guess it?")
+    print(f"I have chosen a number between {lower_bound} and {upper_bound}. Can you guess it?")
 
     while not guessed:
-        user_guess = int(input("Enter your guess: "))
-        attempts += 1
+        try:
+            user_guess = int(input("Enter your guess: "))
+            attempts += 1
 
-        if user_guess < number_to_guess:
-            print("Too low! Try again.")
-        elif user_guess > number_to_guess:
-            print("Too high! Try again.")
-        else:
-            print(f"Congratulations! You guessed the number in {attempts} attempts.")
-            guessed = True
+            if user_guess < lower_bound or user_guess > upper_bound:
+                print(f"Please guess a number between {lower_bound} and {upper_bound}.")
+            elif user_guess < number_to_guess:
+                print("Too low! Try again.")
+            elif user_guess > number_to_guess:
+                print("Too high! Try again.")
+            else:
+                print(f"Congratulations! You guessed the number in {attempts} attempts.")
+                guessed = True
+        except ValueError:
+            print("Invalid input. Please enter a valid integer.")
 
 # Start the game
 guess_number()