import pygame
import random

pygame.init()

# Screen dimensions
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 800

# Colors
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
SKY_BLUE = (0, 191, 255)

# Game variables
GRAVITY = 0.25
FLAP_STRENGTH = -4.5
PIPE_GAP = 150
PIPE_DISTANCE = 300
PIPE_SPEED = -2

# Load images
bird_images = [pygame.image.load("bird1.png"), pygame.image.load("bird2.png"), pygame.image.load("bird3.png")]
pipe_image = pygame.image.load("pipe.png")
bg_image = pygame.image.load("bg.png")

class Bird:
    def __init__(self, x, y):
        self.x = x
        self.y = y
        self.velocity = 0
        self.tick_count = 0
        self.image_count = 0
        self.image = bird_images[0]

    def jump(self):
        self.velocity = FLAP_STRENGTH
        self.tick_count = 0

    def move(self):
        self.tick_count += 1

        # Calculate displacement
        displacement = self.velocity * self.tick_count + 0.5 * GRAVITY * self.tick_count ** 2

        # Terminal velocity
        if displacement >= 16:
            displacement = 16

        if displacement < 0:
            displacement -= 2

        # Update y position
        self.y += displacement

        # Update image
        if self.tick_count % 10 == 0:
            self.image_count += 1
            if self.image_count > 2:
                self.image_count = 0

            self.image = bird_images[self.image_count]

    def draw(self, screen):
        screen.blit(self.image, (self.x, self.y))

    def get_mask(self):
        return pygame.mask.from_surface(self.image)

class Pipe:
    def __init__(self, x):
        self.x = x
        self.height = random.randint(100, SCREEN_HEIGHT - PIPE_GAP - 100)
        self.top_pipe_image = pygame.transform.flip(pipe_image, False, True)
        self.bottom_pipe_image = pipe_image

    def move(self):
        self.x += PIPE_SPEED

    def draw(self, screen):
        screen.blit(self.top_pipe_image, (self.x, self.height - pipe_image.get_height()))
        screen.blit(self.bottom_pipe_image, (self.x, self.height + PIPE_GAP))

    def collide(self, bird):
        bird_mask = bird.get_mask()
        top_mask = pygame.mask.from_surface(self.top_pipe_image)
        bottom_mask = pygame.mask.from_surface(self.bottom_pipe_image)

        top_offset = (self.x - bird.x, int(self.height - pipe_image.get_height() - bird.y))
        bottom_offset = (self.x - bird.x, int(self.height + PIPE_GAP - bird.y))

        top_collision_point = bird_mask.overlap(top_mask, top_offset)
        bottom_collision_point = bird_mask.overlap(bottom_mask, bottom_offset)

        if top_collision_point or bottom_collision_point:
            return True

        return False

def draw_window(screen, bird, pipes):
    screen.blit(bg_image, (0, 0))

    for pipe in pipes:
        pipe.draw(screen)

    bird.draw(screen)

    pygame.display.update()

def main():
    screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
    clock = pygame.time.Clock()

    bird = Bird(SCREEN_WIDTH // 2 - bird_images[0].get_width() // 2,
                SCREEN_HEIGHT // 2 - bird_images[0].get_height() // 2)

    pipes = [Pipe(SCREEN_WIDTH + i * PIPE_DISTANCE) for i in range(3)]

    running = True
    while running:
        clock.tick(30)

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_SPACE:
                    bird.jump()

        # Move bird and pipes
        bird.move()
        for pipe in pipes:
            pipe.move()

            # Check for collision with pipes
            if pipe.collide(bird):
                running = False

            # Move pipe to the right if it goes off the screen to the left
            if pipe.x + pipe_image.get_width() < 0:
                pipes.remove(pipe)
                pipes.append(Pipe(pipe.x + PIPE_DISTANCE * len(pipes)))

# Check if bird hits the ground or goes off the screen to the top
        if bird.y + bird.image.get_height() >= SCREEN_HEIGHT or bird.y < 0:
            running = False

        draw_window(screen, bird, pipes)

    pygame.quit()

if __name__ == "__main__":
    main()
This code creates a simple version of Flappy Bird game using Pygame library. You can run this code by saving it to a file with .py extension and running it using Python 3 interpreter. Make sure you have Pygame library installed and the required image files in the same directory as the code file.
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