diff --git a/cypress/e2e/game-loading.cy.js b/cypress/e2e/game-loading.cy.js
index 27e7fc0..cd941ea 100644
--- a/cypress/e2e/game-loading.cy.js
+++ b/cypress/e2e/game-loading.cy.js
@@ -8,11 +8,13 @@ describe('the word is hidden when the game starts', () => {
   it('should display the word hidden with underscores', () => {
     cy.visit('/')
         .get('div.centered')
+        .get('div#word')
         .contains('_')
         .should('be.visible')
 
     cy.visit('/')
         .get('div.centered')
+        .get('div#word')
         .invoke('text')
         .should('match', /(_)+/)
   })
diff --git a/cypress/e2e/guesses.cy.js b/cypress/e2e/guesses.cy.js
new file mode 100644
index 0000000..6692804
--- /dev/null
+++ b/cypress/e2e/guesses.cy.js
@@ -0,0 +1,57 @@
+it('asks for a character guess', () => {
+  cy.visit('/')
+      .get('div.centered')
+      .get('div.guess')
+      .get('div')
+      .contains("What's your next guess?")
+      .should('be.visible')
+      .next('div')
+      .get('input[type="text"]')
+      .next('button[type="button"]#confirmGuess')
+      .contains('Confirm')
+})
+
+describe('handles invalid characters', () => {
+  it('reports an error if guess is an invalid character', () => {
+    cy.visit('/')
+        .get('input.guess')
+        .type('1')
+        .get('button[type="button"]#confirmGuess')
+        .click()
+        .get('input.guess')
+        .should('have.css', 'border')
+        .should('include', '2px solid rgb(255, 0, 0)')
+  })
+
+  it('removes the error class when the user changes the input', () => {
+    cy.visit('/')
+        .get('input.guess')
+        .clear()
+        .should('not.have.css', 'border: 2px solid rgb(255, 0, 0)')
+
+    cy.visit('/')
+        .get('input.guess')
+        .type('a')
+        .should('not.have.css', 'border: 2px solid rgb(255, 0, 0)')
+  })
+})
+
+it('accepts valid guesses', () => {
+  let letter
+
+  cy.visit('/')
+      .get('div#word > span:first-of-type')
+      .invoke('attr', 'x-data', '{ hidden:false }')
+      .invoke('attr', 'x-data', '{ hidden:true }')
+      .then(($el) => {
+        letter = $el.text()
+        cy.get('input.guess')
+            .type(letter)
+      })
+      .invoke('attr', 'x-data', '{ hidden:true }')
+      .get('button[type="button"]#confirmGuess')
+      .click()
+      .get('div#word > span:first-of-type')
+      .should('have.attr', 'x-data', '{ hidden:false }')
+      .should('contain.text', letter)
+})
diff --git a/index.html b/index.html
index cf5d4bb..8af70b7 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,6 @@
           content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
     <meta http-equiv="X-UA-Compatible" content="ie=edge">
     <title>Hangman game</title>
-    <script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
     <style>
         div.centered {
             position: absolute;
@@ -17,27 +16,86 @@
         }
 
         span.char {
-            margin-right: 1px;
+            margin-right: 4px;
+        }
+
+        input.invalid {
+            border: 2px solid red;
         }
     </style>
+    <script src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js" defer></script>
 </head>
     <body>
-        <div class="centered"
-             x-data="{ wordToBeGuessed: generateWordToBeGuessed() }">
-            <template x-for="char in wordToBeGuessed">
-                <span x-data="{ hidden:true }">
-                        <span class="char"
-                              x-show="hidden"
-                              x-text="hiddenChar(char)"></span>
-                        <span class="char"
-                              x-show="!hidden"
-                              x-text="char"></span>
-                </span>
-            </template>
+        <div class="centered">
+            <div id="word">
+                <template x-for="char in $store.defaultStore.hiddenWord">
+                    <!-- TODO: non si vedono piu i caratteri -->
+                    <span
+                        class="char"
+                        x-text="char">
+                    </span>
+                </template>
+            </div>
+            <div class="guess">
+                <div>What's your next guess?</div>
+                <div>
+                    <input class="guess"
+                           type="text"
+                           maxlength="1"
+                           x-model="$store.defaultStore.guess"
+                    />  <!-- TODO: questo x-model non sembra funzionare correttamente -->
+                    <button type="button"
+                            id="confirmGuess">
+                        Confirm
+                    </button>
+                </div>
+            </div>
         </div>
+        <input type="text" x-model="$store.defaultStore.hiddenWord">  <!-- TODO: messo solo per vedere la hiddenword -->
     </body>
     <script>
-        function generateWordToBeGuessed() {
+        document.addEventListener('alpine:init', () => {
+            Alpine.store('defaultStore', {
+                word: generateWord(),
+                hiddenWord: '',
+                guess: '',
+                init() {
+                    this.hiddenWord = this.word.replace(/^[A-Za-z]+/, '_')      // TODO: questa regex non funziona correttamente
+                },
+            })
+        })
+    </script>
+    <script>
+        let input = document.querySelector('input.guess')
+
+        document.querySelector('button#confirmGuess')
+                .addEventListener(
+                    'click',
+                    function () {
+                        if (!(Alpine.store('defaultStore').guess >= 'a' && Alpine.store('defaultStore').guess <= 'z')) {
+                            input.classList.add('invalid')
+                            return
+                        }
+
+                        for (let i = 0; i < Alpine.store('defaultStore').word.length; i++) {
+                            if(Alpine.store('defaultStore').word[i] === Alpine.store('defaultStore').guess) {
+                                Alpine.store('defaultStore').hiddenWord[i] = Alpine.store('defaultStore').word[i]
+                            }
+                        }
+
+                        Alpine.store('defaultStore').guess = ''
+                    }
+        )
+
+        input.addEventListener(
+            'keyup',
+            function () {
+                input.classList.remove('invalid')
+                input.value = input.value.toLowerCase()
+            }
+        )
+
+        function generateWord() {
             let words = [
                 'andare',
                 'ape',
@@ -71,12 +129,11 @@
                 'tempo',
             ];
 
-            let index = Math.floor(Math.random() * words.length);
-            return words[index];
-        }
+            let index = Math.floor(
+                Math.random() * words.length
+            );
 
-        function hiddenChar(char) {
-            return '_';
+            return words[index];
         }
     </script>
 </html>
