STEP 17: Time to create the bottom block. We'll start by creating a variable for the height.

  • Click on the LOGIC tab. Go to and drag Integer Variable inside the interval() event.
  • Change the name of the variable (the word before the = sign) to bot_height.
  • Change the value (after the = sign) to 350 - top_height.

Now we will always have a gap of 350 pixels to move the ship through.

stage.set_background("space") sprite = codesters.Sprite("spaceship") sprite.set_size(0.5) sprite.go_to(-200, 0) stage.set_gravity(10) stage.disable_all_walls() def space_bar(): sprite.jump(5) # add other actions... stage.event_key("space", space_bar) def interval(): top_height = random.randint(50, 300) # sprite = codesters.Sprite("image", x, y) top_rock = codesters.Sprite("asteroid", 0, 0) top_rock.set_height(top_height) top_rock.set_gravity_off() top_rock.set_y_speed(0) top_rock.set_top(250) # add any other actions... stage.event_interval(interval, 2)