B-6-2

import pyxel

pyxel.init(200,200)



a = 0


def update():
    global a
    a += 1
    if a > 100:#Defining: If the circle goes to the edge, retrun to starting point
        a=0


def draw():
    global a
    pyxel.cls(7)
    pyxel.circ(100+a, a, 10, 0)
    pyxel.circ(200-a, 100+a, 10, 0)
    pyxel.circ(100-a, 200-a, 10, 0)
    pyxel.circ(a, 100-a, 10, 0)

    
pyxel.run(update, draw)