diff --git a/style.css b/style.css
index 91fd283..3ea1255 100644
--- a/style.css
+++ b/style.css
@@ -110,14 +110,13 @@ input[type="number"]::-webkit-calendar-picker-indicator {
     font-size: 0.9rem !important;
 }
 .grid input:disabled {
-    color: white;
-    background: #6666ff;
+    color: white !important;
+    background: #6666ff !important;
     cursor: not-allowed !important;
 }
-.grid input:disabled,
 .grid input.forbidden:enabled {
-    background: #ffffaa;
-    cursor: not-allowed !important;
+    background: #ffffaa !important;
+    cursor: not-allowed;
 }
 .grid input.same-value:enabled {
     background: #ffff33;
@@ -129,7 +128,7 @@ input[type="number"]::-webkit-calendar-picker-indicator {
 }
 .grid input.same-value:disabled,
 .tools button.same-value:enabled,
-.tools input:enabled:checked+label {
+.tools input:enabled:checked + label {
     color: #ffffaa !important;
     background: #00b359 !important;
 }
@@ -138,7 +137,7 @@ input[type="number"]::-webkit-calendar-picker-indicator {
 }
 
 .tools button,
-.tools input+label {
+.tools input + label {
     color: white;
     text-shadow: -1px -1px #5b6c9e;
     background: #8ca6f2;
@@ -156,22 +155,28 @@ input[type="number"]::-webkit-calendar-picker-indicator {
     height: 24px;
 }
 .tools input {
-    display:none;
+    position: fixed;
+    opacity: 0;
+    width: 0;
+    pointer-events: none;
 }
 .tools button:enabled:hover,
-.tools input:enabled:hover+label {
+.tools button:enabled:focus,
+.tools input:enabled:hover + label,
+.tools input:enabled:focus + label {
     border-width: 1px;
     border-style: outset;
     padding: 5px 5px 5px 6px;
     margin:  1px 1px 1px 2px;
 }
-.tools input:enabled:checked:hover+label {
+.tools input:enabled:checked:hover + label,
+.tools input:enabled:checked:focus + label {
     border-width: 3px;
     border-style: inset;
     padding: 4px 2px 2px 5px;
     margin:  1px 1px 1px 2px;
 }
-.tools input:enabled:checked+label {
+.tools input:enabled:checked + label {
     text-shadow: -1px -1px #005f2f;
     border: 2px inset #00b359;
     background: #00b359;
@@ -179,14 +184,14 @@ input[type="number"]::-webkit-calendar-picker-indicator {
     margin:  1px 1px 0px 2px;
 }
 .tools button:enabled:active,
-.tools input:enabled:active+label {
+.tools input:enabled:active + label {
     border-width: 4px !important;
     border-style: inset !important;
     padding: 4px 0px 0px 5px !important;
     margin:  0px 1px 0px 2px !important;
 }
 .tools button:disabled,
-.tools input:disabled+label {
+.tools input:disabled + label {
     text-shadow: -1px -1px #555;
     color: #ccc;
     background: darkgrey;
diff --git a/sudoku.js b/sudoku.js
index 6d096ca..21633b8 100644
--- a/sudoku.js
+++ b/sudoku.js
@@ -52,6 +52,35 @@ window.onload = function () {
         rowId++
     }
 
+    loadSavedGame()
+
+    boxes.forEach(box => {
+        box.neighbourhood = new Set(rows[box.rowId].concat(columns[box.columnId]).concat(regions[box.regionId]))
+        box.neighbourhood.delete(box)
+        box.neighbourhood = Array.from(box.neighbourhood)
+        searchCandidatesOf(box)
+    })
+
+    for (label of document.getElementsByTagName("label")) {
+        label.control.label = label
+    }
+
+    if (/Win/.test(navigator.platform) || /Linux/.test(navigator.platform)) accessKeyModifiers = "Alt+Maj+"
+    else if (/Mac/.test(navigator.platform)) accessKeyModifiers = "⌃⌥"
+    for (node of document.querySelectorAll("*[accesskey]")) {
+        shortcut = ` [${node.accessKeyLabel||(accessKeyModifiers+node.accessKey)}]`
+        if (node.title) node.title += shortcut
+        else if (node.label) node.label.title += shortcut
+    }
+
+    refreshUI()
+
+    if ("serviceWorker" in navigator) {
+        navigator.serviceWorker.register(`service-worker.php?location=${location.pathname}`)
+    }
+}
+
+function loadSavedGame() {
     const savedGame = localStorage[location.pathname]
     if (savedGame) {
         boxes.forEach((box, i) => {
@@ -62,25 +91,6 @@ window.onload = function () {
         })
         fixGridLink.href = savedGame
     }
-
-    boxes.forEach(box => {
-        box.neighbourhood = new Set(rows[box.rowId].concat(columns[box.columnId]).concat(regions[box.regionId]))
-        box.neighbourhood.delete(box)
-        box.neighbourhood = Array.from(box.neighbourhood)
-        searchCandidatesOf(box)
-    })
-
-    if (/Win/.test(navigator.platform) || /Linux/.test(navigator.platform)) accessKeyModifiers = "Alt+Maj+"
-    else if (/Mac/.test(navigator.platform)) accessKeyModifiers = "⌃⌥"
-    for (node of document.querySelectorAll("*[accesskey]")) {
-        node.title += " [" + (node.accessKeyLabel || accessKeyModifiers + node.accessKey) + "]"
-    }
-
-    refreshUI()
-
-    if ("serviceWorker" in navigator) {
-        navigator.serviceWorker.register(`service-worker.php?location=${location.pathname}`)
-    }
 }
 
 function searchCandidatesOf(box) {
@@ -111,10 +121,6 @@ function onfocus() {
 }
 
 function onclick() {
-    if (this.value == "" && this.candidates.size == 1) {
-        valueToInsert = this.candidates.values().next().value
-        document.getElementById("insertRadio" + valueToInsert).checked = true
-    }
     if (inkPenRadio.checked) {
         if (valueToInsert) {
             this.value = valueToInsert
@@ -145,20 +151,95 @@ function oninput() {
         this.previousPlaceholder = this.placeholder
         refreshBox(this)
     }
+
+    if (suggestionTimer) clearTimeout(suggestionTimer)
+    suggestionTimer = setTimeout(showSuggestion, SUGESTION_DELAY)
 }
 
 function refreshBox(box) {
+    saveGame()
+    checkBox(box)
+    refreshUI()
+}
+
+function saveGame() {
     let saveGame = boxes.map(box => box.value || UNKNOWN).join("")
     localStorage[location.pathname] = saveGame
     fixGridLink.href = saveGame
+}
 
+function refreshUI() {
+    enableRadio()
+    highlight()
+    showEasyBoxes()
+}
+
+function enableRadio() {
+    for (radio of insertRadioGroup.getElementsByTagName("input")) {
+        if (boxes.filter(box => box.value == "").some(box => box.candidates.has(radio.value))) {
+            radio.disabled = false
+            radio.label.title = `Insérer un ${radio.value} [${radio.accessKeyLabel||(accessKeyModifiers+radio.accessKey)}]`
+        } else {
+            radio.disabled = true
+            radio.label.title = `Tous les ${radio.value} sont posés.`
+            if (valueToInsert == radio.value) {
+                let nextRadio = document.querySelector(".insertRadioGroup :checked ~ input:enabled") || document.querySelector(".insertRadioGroup :enabled")
+                if (nextRadio) {
+                    nextRadio.click()
+                    nextRadio.onfocus()
+                } else {
+                    valueToInsert = ""
+                }
+            }
+        }
+    }
+}
+
+function highlight() {
+    boxes.forEach(box => {
+        if (valueToInsert && box.value == valueToInsert) {
+            box.classList.add("same-value")
+            box.tabIndex = -1
+        } else {
+            box.classList.remove("same-value")
+            if (box.disabled) {
+                box.classList.add("forbidden")
+            } else {
+                if (valueToInsert && highlighterCheckbox.checked && !box.candidates.has(valueToInsert)) {
+                    box.classList.add("forbidden")
+                    box.tabIndex = -1
+                } else {
+                    box.classList.remove("forbidden")
+                    box.tabIndex = 0
+                }
+            }
+        }
+    })
+    highlighterCheckbox.label.title = "Surligner les lignes, colonnes et régions contenant déjà " + (valueToInsert? "un " + valueToInsert: "le chiffre sélectionné")
+}
+
+function showEasyBoxes() {
+    boxes.filter(box => !box.disabled).forEach(box => {
+        if (!box.value && box.candidates.size == 1) {
+            box.classList.add("one-candidate")
+            box.onclick = function() {
+                valueToInsert = this.candidates.values().next().value
+                document.getElementById("insertRadio" + valueToInsert).checked = true
+                onclick.apply(box)
+            }
+        } else {
+            box.classList.remove("one-candidate")
+            box.onclick = onclick
+        }
+    })
+}
+
+function checkBox(box) {
     box.neighbourhood.concat([box]).forEach(neighbour => {
         searchCandidatesOf(neighbour)
         neighbour.setCustomValidity("")
     })
 
-    refreshUI()
-
     for (neighbour1 of box.neighbourhood) {
         if (neighbour1.value) {
             for (area of [
@@ -187,56 +268,6 @@ function refreshBox(box) {
     }
 }
 
-function refreshUI() {
-    for (radio of insertRadioGroup.getElementsByTagName("input")) {
-        const label = radio.nextElementSibling
-        if (boxes.filter(box => box.value == "").some(box => box.candidates.has(radio.value))) {
-            radio.disabled = false
-            if (radio.previousTitle) {
-                label.title = radio.previousTitle
-                label.previousTitle = null
-            }
-        } else {
-            radio.disabled = true
-            label.previousTitle = label.title
-            label.title = `Tous les ${radio.value} sont posés`
-            if (valueToInsert == radio.value) valueToInsert = ""
-        }
-    }
-
-    highlight()
-
-    boxes.filter(box => !box.disabled).forEach(box => {
-        if (!box.value && box.candidates.size == 1) box.classList.add("one-candidate")
-        else box.classList.remove("one-candidate")
-    })
-    if (suggestionTimer) clearTimeout(suggestionTimer)
-    suggestionTimer = setTimeout(showSuggestion, SUGESTION_DELAY)
-}
-
-function highlight() {
-    boxes.forEach(box => {
-        if (valueToInsert && box.value == valueToInsert) {
-            box.classList.add("same-value")
-            box.tabIndex = -1
-        } else {
-            box.classList.remove("same-value")
-            if (box.disabled) {
-                box.classList.add("forbidden")
-            } else {
-                if (valueToInsert && highlighterCheckbox.checked && !box.candidates.has(valueToInsert)) {
-                    box.classList.add("forbidden")
-                    box.tabIndex = -1
-                } else {
-                    box.classList.remove("forbidden")
-                    box.tabIndex = 0
-                }
-            }
-        }
-    })
-    highlighterCheckbox.nextElementSibling.title = "Surligner les lignes, colonnes et régions contenant déjà " + (valueToInsert? "un " + valueToInsert: "le chiffre sélectionné")
-}
-
 function onblur() {
     if (this.classList.contains("pencil")) {
         this.placeholder = this.value
@@ -289,7 +320,9 @@ function restart() {
 function showSuggestion() {
     const easyBoxes = boxes.filter(box => box.value == "" && box.candidates.size == 1)
     if (easyBoxes.length) {
-        shuffle(easyBoxes)[0].placeholder = "💡"
+        let randomEasyBox = shuffle(easyBoxes)[0]
+        randomEasyBox.placeholder = "💡"
+        randomEasyBox.focus()
     } else {
         clearTimeout(suggestionTimer)
         suggestionTimer = null
@@ -321,17 +354,19 @@ function oncontextmenu(event) {
     }
     contextMenu.style.left = `${event.pageX}px`
     contextMenu.style.top = `${event.pageY}px`
+    console.log(event.target)
     contextMenu.style.display = "block"
     return false
 }
 
 document.onclick = function (event) {
-    contextMenu.style.display = "none"
+    if (contextMenu.style.display == "block")
+        contextMenu.style.display = "none"
 }
 
 document.onkeydown = function(event) {
-    if (event.key == "Escape") {
+    if (event.key == "Escape" && contextMenu.style.display == "block") {
         event.preventDefault()
         contextMenu.style.display = "none"
     }
-}
\ No newline at end of file
+}
diff --git a/sudoku.php b/sudoku.php
index 8d94f0f..52eb670 100644
--- a/sudoku.php
+++ b/sudoku.php
@@ -90,26 +90,17 @@
             <div id='insertRadioGroup' class='insertRadioGroup'>
 <?php
         for($value=1; $value<=9; $value++) {
-            echo "                <input type='radio' id='insertRadio$value' value='$value' name='insertRadioGroup' onclick='insert(this)' accesskey='$value'/>\n";
-            echo "                <label for='insertRadio$value' title='Insérer un $value'>$value</label>\n";
+            echo "                <input type='radio' id='insertRadio$value' value='$value' name='insertRadioGroup' onclick='insert(this)' accesskey='$value'/><label for='insertRadio$value' title='Insérer un $value'>$value</label>\n";
         }
 ?>
             </div>
             <div>
-                <input id='highlighterCheckbox' type="checkbox" onclick='highlight()'/>
-                <label for='highlighterCheckbox' title='Surligner les lignes, colonnes et régions contenant déjà le chiffre sélectionné'><img src='img/highlighter.svg' alt='Surligneur'></label>
-                <input type='radio' id='inkPenRadio' name='tool' onclick='grid.style.cursor = "url(img/ink-pen.svg) 2 22, auto"' checked/>
-                <label for='inkPenRadio' title='Écrire un chiffre'><img src='img/ink-pen.svg' alt='Stylo indélébile'/></label>
-                <input type='radio' id='pencilRadio' name='tool' onclick='grid.style.cursor = "url(img/pencil.svg) 2 22, auto"'/>
-                <label for='pencilRadio' title='Prendre des notes'><img src='img/pencil.svg' alt='Crayon'/></label>
-                <input type='radio' id='eraserRadio' name='tool' onclick='grid.style.cursor = "url(img/eraser.svg) 2 22, auto"'/>
-                <label for='eraserRadio' title='Effacer une case'><img src='img/eraser.svg' alt='Gomme'/></label>
-                <button type='button' class='warning' onclick='restart()' title='Recommencer'>
-                    <img src='img/restart.svg' alt='Recommencer'/>
-                </button>
-                <button id='undoButton' type='button' onclick='undo()' disabled title='Annuler' accesskey='z'>
-                    <img src='img/undo.svg' alt='Annuler'/>
-                </button>
+                <input id='highlighterCheckbox' type="checkbox" onclick='highlight()'/><label for='highlighterCheckbox' title='Surligner les lignes, colonnes et régions contenant déjà le chiffre sélectionné'><img src='img/highlighter.svg' alt='Surligneur'></label>
+                <input type='radio' id='inkPenRadio' name='tool' onclick='grid.style.cursor = "url(img/ink-pen.svg) 2 22, auto"' checked/><label for='inkPenRadio' title='Écrire un chiffre'><img src='img/ink-pen.svg' alt='Stylo indélébile'/></label>
+                <input type='radio' id='pencilRadio' name='tool' onclick='grid.style.cursor = "url(img/pencil.svg) 2 22, auto"'/><label for='pencilRadio' title='Prendre des notes'><img src='img/pencil.svg' alt='Crayon'/></label>
+                <input type='radio' id='eraserRadio' name='tool' onclick='grid.style.cursor = "url(img/eraser.svg) 2 22, auto"'/><label for='eraserRadio' title='Effacer une case'><img src='img/eraser.svg' alt='Gomme'/></label>
+                <button type='button' class='warning' onclick='restart()' title='Recommencer'><img src='img/restart.svg' alt='Recommencer'/></button>
+                <button id='undoButton' type='button' onclick='undo()' disabled title='Annuler' accesskey='z'><img src='img/undo.svg' alt='Annuler'/></button>
             </div>
         </section>
         <section>