diff --git a/index.js b/index.js
index 4c2a94e..f951588 100644
--- a/index.js
+++ b/index.js
@@ -18,6 +18,7 @@ const maxNumberOfAttempts = 5;
 // <- 32
 // > getRandomNumber(1, 50)
 // <- 11
+ 
 function getRandomNumber(min, max) {
   return Math.floor(Math.random() * (max - min)) + min;
 }
@@ -25,13 +26,18 @@ function getRandomNumber(min, max) {
 function checkGuess() {
   // Get value from guess input element
   const guess = parseInt(guessInput.value, 10);
-  attempts = attempts + 1;
-
+  
   hideAllMessages();
 
+  if ( guess < 1 || guess > 99 || isNaN(guess) ) {            // Stretch Goals: Input validation
+    console.log('Invalid guess');
+    return;
+  }
+  attempts = attempts + 1;
+
   if (guess === targetNumber) {
     numberOfGuessesMessage.style.display = '';
-    numberOfGuessesMessage.innerHTML = `You made ${attempts} guesses`;
+    numberOfGuessesMessage.innerHTML = `You made ${attempts} ${attempts === 1 ? 'guess' : 'guesses'}`; // Stretch Goals: If there is only one guess left, it should say "guess" (singular) instead of "guesses" (plural)
 
     correctMessage.style.display = '';
 
@@ -43,16 +49,16 @@ function checkGuess() {
     if (guess < targetNumber) {
       tooLowMessage.style.display = '';
     } else {
-      tooLowMessage.style.display = '';
+      tooHighMessage.style.display = '';                      // Was an error here, should be tooHighMessage not tooLowMessage
     }
 
     const remainingAttempts = maxNumberOfAttempts - attempts;
 
     numberOfGuessesMessage.style.display = '';
-    numberOfGuessesMessage.innerHTML = `You guessed ${guess}. <br> ${remainingAttempts} guesses remaining`;
+    numberOfGuessesMessage.innerHTML = `You guessed ${guess}. <br> ${remainingAttempts} ${remainingAttempts === 1 ? 'guess' : 'guesses'} remaining`; // Stretch Goals: If there is only one guess left, it should say "guess" (singular) instead of "guesses" (plural)
   }
 
-  if (attempts ==== maxNumberOfAttempts) {
+  if (attempts === maxNumberOfAttempts) {                     // Was an error here, should be === not ====
     submitButton.disabled = true;
     guessInput.disabled = true;
   }
@@ -63,21 +69,21 @@ function checkGuess() {
 }
 
 function hideAllMessages() {
-  for (let elementIndex = 0; elementIndex <= messages.length; elementIndex++) {
+  for (let elementIndex = 0; elementIndex < messages.length; elementIndex++) { // Was an error here, should be elementIndex < messages.length not elementIndex <= messages.length
     messages[elementIndex].style.display = 'none';
   }
 }
 
-funtion setup() {
+function setup() {                                            // Was an error here, should be function not funtion
   // Get random number
-  targetNumber = getRandomNumber(1, 100);
+  targetNumber = getRandomNumber(1, 99);                      // Was an error here, should be 99 not 100
   console.log(`target number: ${targetNumber}`);
 
   // Reset number of attempts
-  maxNumberOfAttempts = 0;
+  attempts = 0;                                               // Was an error here, should be attempts not maxNumberOfAttempts
 
   // Enable the input and submit button
-  submitButton.disabeld = false;
+  submitButton.disabled = false;                              // Was an error here, should be disabled not disabeld
   guessInput.disabled = false;
 
   hideAllMessages();