diff --git a/Space invaders /space_invaders.py b/Space invaders /space_invaders.py
new file mode 100644
index 0000000..d7f4163
--- /dev/null
+++ b/Space invaders /space_invaders.py	
@@ -0,0 +1,348 @@
+# space_invaders.py
+import pygame
+import random
+import math
+from collections import deque
+
+# ---------- Config ----------
+WIDTH, HEIGHT = 900, 700
+FPS = 60
+PLAYER_SPEED = 420       # px/sec
+BULLET_SPEED = 700
+ENEMY_BASE_SPEED = 40   # px/sec
+WAVE_GAP = 1.2          # seconds between enemy spawn rows
+BOSS_EVERY = 5          # boss every N waves
+POWERUP_DURATION = 8.0  # seconds
+# ----------------------------
+
+pygame.init()
+screen = pygame.display.set_mode((WIDTH, HEIGHT))
+pygame.display.set_caption("Space Invaders - Advanced (Pygame)")
+clock = pygame.time.Clock()
+font = pygame.font.SysFont("Arial", 20)
+big_font = pygame.font.SysFont("Arial", 40)
+
+# Colors
+WHITE = (255, 255, 255)
+GREY  = (180, 180, 180)
+BLACK = (0, 0, 0)
+RED   = (220, 60, 60)
+GREEN = (60, 200, 80)
+YELLOW= (240, 220, 60)
+BLUE  = (70, 130, 240)
+PURPLE= (170, 80, 200)
+
+# ---------- Utility ----------
+def draw_text(surf, text, size, x, y, color=WHITE):
+    f = pygame.font.SysFont("Arial", size)
+    r = f.render(text, True, color)
+    surf.blit(r, (x, y))
+
+# ---------- Sprites ----------
+class Player(pygame.sprite.Sprite):
+    def __init__(self):
+        super().__init__()
+        self.w, self.h = 54, 28
+        self.surf = pygame.Surface((self.w, self.h), pygame.SRCALPHA)
+        pygame.draw.polygon(self.surf, BLUE, [(0,self.h),(self.w/2,0),(self.w,self.h)])
+        self.rect = self.surf.get_rect(midbottom=(WIDTH//2, HEIGHT - 24))
+        self.speed = PLAYER_SPEED
+        self.shoot_cooldown = 0.22
+        self.shoot_timer = 0.0
+        self.lives = 3
+        self.invulnerable = 0.0
+        self.shield = False
+        self.powerups = {}  # name: expiry_time
+        self.score = 0
+
+    def update(self, dt, keys):
+        move = 0
+        if keys[pygame.K_a] or keys[pygame.K_LEFT]:
+            move -= 1
+        if keys[pygame.K_d] or keys[pygame.K_RIGHT]:
+            move += 1
+        self.rect.x += move * self.speed * dt
+        self.rect.x = max(6, min(WIDTH - self.rect.width - 6, self.rect.x))
+
+        self.shoot_timer = max(0, self.shoot_timer - dt)
+        if self.invulnerable > 0:
+            self.invulnerable -= dt
+
+        now = pygame.time.get_ticks() / 1000.0
+        expired = [p for p,e in self.powerups.items() if e <= now]
+        for p in expired:
+            del self.powerups[p]
+        self.shield = 'shield' in self.powerups
+
+    def can_shoot(self):
+        return self.shoot_timer <= 0
+
+    def shoot(self, bullets_group):
+        now = pygame.time.get_ticks() / 1000.0
+        rapid = 'rapid' in self.powerups
+        spread = 'spread' in self.powerups
+
+        if not self.can_shoot():
+            return
+        self.shoot_timer = 0.08 if rapid else self.shoot_cooldown
+
+        if spread:
+            angles = [-12, 0, 12]
+            for a in angles:
+                bullets_group.add(Bullet(self.rect.centerx, self.rect.top-8, a, is_player=True))
+        else:
+            bullets_group.add(Bullet(self.rect.centerx, self.rect.top-8, 0, is_player=True))
+
+    def hit(self):
+        if self.invulnerable > 0:
+            return False
+        if self.shield:
+            if 'shield' in self.powerups:
+                del self.powerups['shield']
+                self.shield = False
+                self.invulnerable = 0.5
+                return False
+        self.lives -= 1
+        self.invulnerable = 1.0
+        return True
+
+
+class Bullet(pygame.sprite.Sprite):
+    def __init__(self, x, y, angle_deg, is_player=True):
+        super().__init__()
+        self.is_player = is_player
+        self.surf = pygame.Surface((4, 12), pygame.SRCALPHA)
+        color = YELLOW if is_player else RED
+        pygame.draw.rect(self.surf, color, (0,0,4,12))
+        self.rect = self.surf.get_rect(center=(x,y))
+        self.angle = math.radians(angle_deg)
+        direction = -1 if is_player else 1
+        self.vx = math.sin(self.angle) * BULLET_SPEED * (1 if is_player else 0.7)
+        self.vy = math.cos(self.angle) * BULLET_SPEED * direction
+
+    def update(self, dt):
+        self.rect.x += int(self.vx * dt)
+        self.rect.y += int(self.vy * dt)
+        if self.rect.bottom < -10 or self.rect.top > HEIGHT + 10 or self.rect.right < -40 or self.rect.left > WIDTH + 40:
+            self.kill()
+
+
+class Enemy(pygame.sprite.Sprite):
+    COLORS = [(200,80,80),(80,200,120),(200,180,60)]
+    def __init__(self, x, y, row, speed=ENEMY_BASE_SPEED):
+        super().__init__()
+        self.size = 36
+        self.surf = pygame.Surface((self.size, self.size), pygame.SRCALPHA)
+        pygame.draw.rect(self.surf, Enemy.COLORS[row % len(Enemy.COLORS)], (0,0,self.size,self.size), border_radius=6)
+        pygame.draw.rect(self.surf, BLACK, (6,8, self.size-12,8))
+        self.rect = self.surf.get_rect(topleft=(x,y))
+        self.row = row
+        self.speed = speed
+        self.direction = 1
+        self.hp = 1
+
+    def update(self, dt, sway):
+        dx, dy = sway
+        self.rect.x += int(dx * dt)
+        self.rect.y += int(dy * dt)
+
+
+class Boss(pygame.sprite.Sprite):
+    def __init__(self, x, y, hp):
+        super().__init__()
+        self.w = 220
+        self.h = 90
+        self.surf = pygame.Surface((self.w, self.h), pygame.SRCALPHA)
+        self.rect = self.surf.get_rect(center=(x,y))
+        self.max_hp = hp
+        self.hp = hp
+        self.phase = 1
+        self.attack_timer = 0.0
+        self.vx = 80
+        self.dir = 1
+
+    def update(self, dt):
+        self.rect.x += int(self.dir * self.vx * dt)
+        if self.rect.left < 30:
+            self.rect.left = 30
+            self.dir *= -1
+        if self.rect.right > WIDTH - 30:
+            self.rect.right = WIDTH - 30
+            self.dir *= -1
+        ratio = self.hp / max(1, self.max_hp)
+        self.phase = 1 if ratio > 0.66 else (2 if ratio > 0.33 else 3)
+
+    def draw(self, surface):
+        surf = pygame.Surface((self.w, self.h), pygame.SRCALPHA)
+        pygame.draw.rect(surf, PURPLE, (0, 0, self.w, self.h), border_radius=14)
+        for i in range(3):
+            pygame.draw.circle(surf, (30,30,30), (40 + i*60, 34), 12)
+        surface.blit(surf, self.rect.topleft)
+        hp_w = int((self.hp / self.max_hp) * (self.w - 10))
+        pygame.draw.rect(surface, (80,80,80), (self.rect.left+5, self.rect.top-12, self.w-10, 8))
+        pygame.draw.rect(surface, (200,40,40), (self.rect.left+5, self.rect.top-12, hp_w, 8))
+
+
+class PowerUp(pygame.sprite.Sprite):
+    TYPES = ['shield','rapid','spread']
+    ICON = {'shield': GREEN, 'rapid': YELLOW, 'spread': PURPLE}
+    def __init__(self, x, y, kind=None):
+        super().__init__()
+        self.kind = kind or random.choice(self.TYPES)
+        self.surf = pygame.Surface((26,26), pygame.SRCALPHA)
+        pygame.draw.circle(self.surf, PowerUp.ICON[self.kind], (13,13), 12)
+        self.rect = self.surf.get_rect(center=(x,y))
+        self.vy = 80
+
+    def update(self, dt):
+        self.rect.y += int(self.vy * dt)
+        if self.rect.top > HEIGHT + 10:
+            self.kill()
+
+
+class Explosion(pygame.sprite.Sprite):
+    def __init__(self, x, y, color=YELLOW):
+        super().__init__()
+        self.particles = []
+        self.timer = 0.5
+        self.x, self.y = x, y
+        self.color = color
+        for _ in range(12):
+            angle = random.random()*math.pi*2
+            speed = random.uniform(60,220)
+            life = random.uniform(0.3,0.7)
+            self.particles.append([x,y,math.cos(angle)*speed,math.sin(angle)*speed,life])
+
+    def update(self, dt):
+        self.timer -= dt
+        for p in self.particles:
+            p[0] += p[2] * dt
+            p[1] += p[3] * dt
+            p[4] -= dt
+        if self.timer <= 0:
+            self.kill()
+
+    def draw(self, surf):
+        for p in self.particles:
+            if p[4] > 0:
+                alpha = int(max(0, p[4])*255)
+                s = pygame.Surface((6,6), pygame.SRCALPHA)
+                s.fill((*self.color, alpha))
+                surf.blit(s, (p[0]-3,p[1]-3))
+
+
+# ---------- Wave Manager ----------
+class WaveManager:
+    def __init__(self):
+        self.wave = 0
+        self.enemies_group = pygame.sprite.Group()
+        self.enemy_spawn_queue = deque()
+        self.sway_dir = 1
+        self.sway_dy = 10
+        self.enemy_speed = ENEMY_BASE_SPEED
+
+    def start_next_wave(self):
+        self.wave += 1
+        self.enemies_group.empty()
+        self.enemy_spawn_queue.clear()
+        self.enemy_speed = ENEMY_BASE_SPEED + (self.wave - 1) * 6
+        if self.wave % BOSS_EVERY == 0:
+            return 'boss'
+        rows = min(5, 2 + self.wave // 2)
+        cols = min(12, 6 + self.wave)
+        margin_x, margin_y = 60, 80
+        spacing_x = (WIDTH - 2*margin_x) // cols
+        for r in range(rows):
+            y = margin_y + r * 56
+            for c in range(cols):
+                x = margin_x + c * spacing_x + random.randint(-6,6)
+                e = Enemy(x, y, r, speed=self.enemy_speed)
+                e.hp = 1 + (r // 2)
+                self.enemies_group.add(e)
+        return 'normal'
+
+    def update(self, dt):
+        if self.enemies_group:
+            left = min(e.rect.left for e in self.enemies_group)
+            right = max(e.rect.right for e in self.enemies_group)
+            move_dx = self.enemy_speed * self.sway_dir * 0.6
+            move_dy = 0
+            if left < 20 and self.sway_dir < 0:
+                self.sway_dir *= -1
+                move_dx = 0
+                move_dy = self.sway_dy * 4
+            if right > WIDTH-20 and self.sway_dir > 0:
+                self.sway_dir *= -1
+                move_dx = 0
+                move_dy = self.sway_dy * 4
+            for e in list(self.enemies_group):
+                e.update(dt, (move_dx, move_dy))
+
+
+# ---------- Game ----------
+class Game:
+    def __init__(self):
+        self.player = Player()
+        self.player_group = pygame.sprite.GroupSingle(self.player)
+        self.bullets = pygame.sprite.Group()
+        self.enemy_bullets = pygame.sprite.Group()
+        self.wave_manager = WaveManager()
+        self.boss = None
+        self.boss_group = pygame.sprite.Group()
+        self.powerups = pygame.sprite.Group()
+        self.explosions = pygame.sprite.Group()
+        self.running = True
+        self.paused = False
+        self.state = 'playing'
+        self.wave_manager.start_next_wave()
+
+    def update(self, dt, keys):
+        if self.paused or not self.running:
+            return
+
+        self.player.update(dt, keys)
+        if keys[pygame.K_SPACE] or keys[pygame.K_w] or keys[pygame.K_UP]:
+            self.player.shoot(self.bullets)
+
+        self.bullets.update(dt)
+        self.enemy_bullets.update(dt)
+        self.powerups.update(dt)
+        self.explosions.update(dt)
+
+        if self.state == 'playing':
+            self.wave_manager.update(dt)
+
+            for e in list(self.wave_manager.enemies_group):
+                shoot_chance = 0.0009 + self.wave_manager.wave * 0.0007 + (e.row * 0.0004)
+                if random.random() < shoot_chance * (60 * dt):
+                    self.enemy_bullets.add(Bullet(e.rect.centerx, e.rect.bottom + 6, 0, is_player=False))
+
+
+# ---------- Main Loop ----------
+def main():
+    game = Game()
+    running = True
+    while running:
+        dt = clock.tick(FPS) / 1000.0
+        keys = pygame.key.get_pressed()
+
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                running = False
+
+        screen.fill(BLACK)
+        game.update(dt, keys)
+
+        game.player_group.draw(screen)
+        game.wave_manager.enemies_group.draw(screen)
+        game.bullets.draw(screen)
+        game.enemy_bullets.draw(screen)
+        game.powerups.draw(screen)
+        game.explosions.draw(screen)
+
+        pygame.display.flip()
+
+    pygame.quit()
+
+if __name__ == "__main__":
+    main()