JumperGamePlatforms

import pygame
import random

Red = (255,0,0)
Black = (0,0,0)
Blue = (0,255,0)

HEIGHT = 900
WIDTH = 500

pygame.init()
window = pygame.display.set_mode ((WIDTH, HEIGHT))

class Platform(pygame.sprite.Sprite):
    def __init__(self, y, sizex = 100):
        super().__init__()
        self.size_x = sizex
        self.size_y = 15
        self.image = pygame.Surface((self.size_x,self.size_y))
        self.image.fill(Blue)
        self.rect = self.image.get_rect()
        self.rect.left = (random.randrange(0, WIDTH-self.size_x+1))
        self.rect.centery = y

run = True
clock = pygame.time.Clock()
elements = pygame.sprite.Group()
platforms = pygame.sprite.Group()

for x in range(5):
    p = Platform((x+1)*150)
    elements.add(p)
    platforms.add(p)

base = Platform(HEIGHT-20, WIDTH)
elements.add(base)
platforms.add(base)

score = 0
while run:
    window.fill(Black)
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    if len(platforms) < 6:
        p = Platform(-5)
        platforms.add(p)
        elements.add(p)


    elements.update()
    elements.draw(window)
    pygame.display.update()
pygame.quit()