diff --git a/.idea/misc.xml b/.idea/misc.xml
index cf9abe6..cbbff6a 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_20" default="true" project-jdk-name="openjdk-20" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="openjdk-20" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/GuessStarter.java b/src/GuessStarter.java
index 64984df..c7268e0 100644
--- a/src/GuessStarter.java
+++ b/src/GuessStarter.java
@@ -1,4 +1,6 @@
 import java.util.Random;
+import java.util.Scanner;
+import static java.lang.Math.abs;
 
 /**
  * Starter code for the "Guess My Number" exercise.
@@ -6,10 +8,22 @@
 public class GuessStarter {
 
     public static void main(String[] args) {
+
         // pick a random number
         Random random = new Random();
         int number = random.nextInt(100) + 1;
-        System.out.println(number);
+
+        // prompt user to guess a number
+        Scanner entry = new Scanner(System.in);
+        System.out.print("I'm thinking of a number between 1 and 100 (including both). ");
+        System.out.println("Can you guess what it is? ");
+        int guess = entry.nextInt();
+
+        // display user's guess, correct answer, and the difference.
+        int difference = abs(number - guess);
+        System.out.printf("You guessed %d. \n", guess);
+        System.out.printf("The correct number was %d. \n", number);
+        System.out.printf("The difference is %d.", difference);
     }
 
 }