diff --git a/server/main.lua b/server/main.lua
index f18cc27..7ecf543 100644
--- a/server/main.lua
+++ b/server/main.lua
@@ -17,6 +17,7 @@ client:connect("student", password)
 
 playing = false
 won = false
+lives = 10
 
 word = ""
 letters_played = ""
@@ -34,8 +35,31 @@ function draw_ui()
     end
 end
 
-function update_victory()
+function is_won()
+    for i=1, #word do
+        if not was_already_played(word[i]) then
+            return false
+        end
+    end
+    return true
+end
 
+function was_already_played(l)
+    for i=1, #letters_played do
+        if letters_played[i] == l then
+            return true
+        end
+    end
+    return false
+end
+
+function is_in_word(l)
+    for i=1, #word do
+        if word[i] == l then
+            return true
+        end
+    end
+    return false
 end
 
 function broadcast_state()
@@ -71,9 +95,33 @@ function handle_letter(len, message, topic_len, topic_name)
     if topic_name != "pendu/letter" or not playing then
         return
     end
+    if was_already_played(message) then
+        draw_ui()
+        console(message .. " a déjà été joué.")
+        return
+    end
     letters_played = letters_played .. message
-    update_victory()
+    if not is_in_word(message) then
+        lives = lives - 1
+        if lives == 0 then
+            playing = false
+            broadcast_state()
+            draw_ui()
+            return
+        end
+        draw_ui()
+        console(message .. " ne fait pas partie du mot...")
+        return
+    end
+    if not is_won() then
+        draw_ui()
+        console(message .. " trouvé ! Bien joué !")
+        return
+    end
+    won = true
+    playing = false
+    broadcast_state()
     draw_ui()
 end
 
-client:subscribe("pendu/letter", mqtt.QOS0, handle_letter)
\ No newline at end of file
+client:subscribe("pendu/letter", mqtt.QOS0, handle_letter)