diff --git a/src/Game.cpp b/src/Game.cpp
index 829e6c5..08b246e 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -8,11 +8,13 @@
 #include "words.hpp"
 #include "utils.hpp"
 #include "default_font.hpp"
+#include "State.hpp"
 
 const int CHAR_SIZE = 30;
 const int STEP_SIZE = CHAR_SIZE + CHAR_SIZE / 2;
 const int UNDERSCORE_DY = 10;
 const SDL_Color TEXT_COLOR = {255, 255, 255};
+const int MAX_GUESSES = 8;
 
 void Game::Run() {
     if (SDL_Init(SDL_INIT_VIDEO) < 0) {
@@ -67,7 +69,7 @@ void Game::Run() {
     SDL_Quit();
 }
 
-Game::Game() {
+Game::Game() : m_wrong_guesses(0), m_game_state(State::PLAY) {
     const char *defaultFontPath = getDefaultFontPath();
     if (defaultFontPath == nullptr) {
         std::stringstream ss;
@@ -101,7 +103,19 @@ Game::Game() {
 }
 
 void Game::handle_key(SDL_Keycode event) {
-
+    if (!isalpha(event))
+        return;
+    bool is_valid = guess_corrector->has_char(event);
+    if (is_valid) {
+        guess_corrector->add(event);
+        if (guess_corrector->is_filled_out())
+            m_game_state = State::WIN;
+    } else {
+        m_wrong_guesses += 1;
+        if (m_wrong_guesses >= MAX_GUESSES) {
+            m_game_state = State::GAME_OVER;
+        }
+    }
 }
 
 void Game::draw(SDL_Renderer *renderer) {
diff --git a/src/Game.hpp b/src/Game.hpp
index 9def6a9..720cd9d 100644
--- a/src/Game.hpp
+++ b/src/Game.hpp
@@ -7,6 +7,7 @@
 #include "SDL_render.h"
 #include "SDL_ttf.h"
 #include "GuessCorrector.hpp"
+#include "State.hpp"
 
 const SDL_Point SCREEN_SIZE{800, 800};
 
@@ -16,6 +17,8 @@ private:
     std::unique_ptr<GuessCorrector> guess_corrector;
     const char *word;
     _TTF_Font *font;
+    int m_wrong_guesses;
+    State m_game_state;
 
 public:
     static void Run();
@@ -28,5 +31,6 @@ public:
 
 private:
     void draw_guesses(SDL_Renderer *renderer);
+
 };