diff --git a/alien_invasion.py b/alien_invasion.py
index e6e3acb..1bcc4e2 100644
--- a/alien_invasion.py
+++ b/alien_invasion.py
@@ -1,8 +1,12 @@
 import sys
+from time import sleep
 
 import pygame
 
 from settings import Settings
+from game_stats import GameStats
+from scoreboard import Scoreboard
+from button import Button
 from ship import Ship
 from bullet import Bullet
 from alien import Alien
@@ -20,16 +24,23 @@ class AlienInvasion:
         self.settings.screen_height = self.screen.get_rect().height
         pygame.display.set_caption("Alien Invasion")
 
+        # 创建一个用于存储游戏统计信息的实例
+        #   并创建记分牌
+        self.stats = GameStats(self)
+        self.sb = Scoreboard(self)
+
         self.ship = Ship(self)
         self.bullets = pygame.sprite.Group()
         self.aliens = pygame.sprite.Group()
 
         self._create_fleet()
-        
+
+        # 创建Play按钮
+        self.play_button = Button(self,"Play")
         # 背景音乐
         pygame.mixer.music.load('music/flash.mp3')
         pygame.mixer.music.play(-1)  # 重复循环
-        
+
         # 设置背景色
         self.bg_color = (230, 230, 230)
 
@@ -66,9 +77,12 @@ class AlienInvasion:
         """开始游戏的主循环"""
         while True:
             self._check_events()
-            self.ship.update()
-            self._update_bullets()
-            self._update_aliens()
+
+            if self.stats.game_active:
+                self.ship.update()
+                self._update_bullets()
+                self._update_aliens()
+                
             self._update_screen()
 
     def _update_aliens(self):
@@ -79,6 +93,13 @@ class AlienInvasion:
         self._check_fleet_edges()
         self.aliens.update()
 
+        # 检测外星人和飞船之间的碰撞
+        if pygame.sprite.spritecollideany(self.ship, self.aliens):
+            self._ship_hit()
+
+        # 检查是否有外星人到达了屏幕底端
+        self._check_aliens_bottom()
+
     def _update_bullets(self):
         """更新子弹的位置并删除消失的子弹"""
         #更新子弹的位置
@@ -97,11 +118,20 @@ class AlienInvasion:
 
         collisions = pygame.sprite.groupcollide(
             self.bullets, self.aliens, True, True)
+        if collisions:
+            for aliens in collisions.values():
+                self.stats.score += self.settings.alien_points * len(aliens)
+        self.sb.prep_score()
 
         if not self.aliens:
             # 删除现有的子弹并新建一群外星人
             self.bullets.empty()
             self._create_fleet()
+            self.settings.increase_speed()
+
+            # 提高等级
+            self.stats.level += 1
+            self.sb.prep_level()
 
     def _check_events(self):
         """响应按键和鼠标事件"""
@@ -112,6 +142,34 @@ class AlienInvasion:
                 self._check_keydown_events(event)
             elif event.type == pygame.KEYUP:
                 self._check_keyup_events(event)
+            elif event.type == pygame.MOUSEBUTTONDOWN:
+                mouse_pos = pygame.mouse.get_pos()
+                self._check_play_button(mouse_pos)
+
+    def _check_play_button(self,mouse_pos):
+        """在玩家单机Play按钮时开始新游戏"""
+        button_clicked = self.play_button.rect.collidepoint(mouse_pos)
+        if button_clicked and not self.stats.game_active:
+            # 重置游戏设置
+            self.settings.initialize_dynamic_settings()
+
+            # 重置游戏统计信息
+            self.stats.reset_stats()
+            self.stats.game_active = True
+            self.sb.prep_score()
+            self.sb.prep_level()
+            self.sb.prep_ships()
+
+            # 清空余下的外星人和子弹
+            self.aliens.empty()
+            self.bullets.empty()
+
+            # 创建一群新的外星人并让飞船居中
+            self._create_fleet()
+            self.ship.center_ship()
+
+            # 隐藏鼠标光标
+            pygame.mouse.set_visible(False)
 
     def _check_keydown_events(self, event):
         """响应按键"""
@@ -145,6 +203,13 @@ class AlienInvasion:
             bullet.draw_bullet()
         self.aliens.draw(self.screen)
 
+        # 显示得分
+        self.sb.show_score()
+
+        # 如果游戏处于非活动状态，就绘制Play按钮
+        if not self.stats.game_active:
+            self.play_button.draw_button()
+
         pygame.display.flip()
 
     def _check_fleet_edges(self):
@@ -160,6 +225,46 @@ class AlienInvasion:
             alien.rect.y += self.settings.fleet_drop_speed
         self.settings.fleet_direction *= -1
 
+    def _ship_hit(self):
+        """响应飞船被外星人撞到"""
+        if self.stats.ships_left > 0:
+            # 将ships_left减一并更新记分牌
+            self.stats.ships_left -= 1
+            self.sb.prep_ships()
+
+            # 清空余下的外星人和子弹
+            self.aliens.empty()
+            self.bullets.empty()
+
+            # 创建一群新的外星人，并将飞船放到屏幕底端的中央
+            self._create_fleet()
+            self.ship.center_ship()
+
+            # 暂停
+            sleep(0.5)
+        else:
+            self.stats.game_active = False
+            pygame.mouse.set_visible(True)
+
+    def _check_aliens_bottom(self):
+        """检查是否有外星人到达了屏幕底端"""
+        screen_rect = self.screen.get_rect()
+        for alien in self.aliens.sprites():
+            if alien.rect.bottom >= screen_rect.bottom:
+                # 像飞船被撞到一样处理
+                self._ship_hit()
+                break
+
+if __name__ == '__main__':
+    # 创建游戏实例并运行游戏
+    ai = AlienInvasion()
+    ai.run_game()
+    def _change_fleet_direction(self):
+        """将整个外星人下移，并改变它们的方向"""
+        for alien in self.aliens.sprites():
+            alien.rect.y += self.settings.fleet_drop_speed
+        self.settings.fleet_direction *= -1
+
 if __name__ == '__main__':
     # 创建游戏实例并运行游戏
     ai = AlienInvasion()