import turtle as t
t.pensize(1)

t.fillcolor('green')
t.begin_fill()
t.forward(300)
t.left(90)
t.forward(300)
t.left(90)
t.forward(300)
t.left(90)
t.forward(300)

t.end_fill()
t.fillcolor('crimson')
t.begin_fill()

t.setpos(25, 25)

t.left(90)
t.forward(250)
t.left(90)
t.forward(250)
t.left(90)
t.forward(250)
t.left(90)
t.forward(250)

t.end_fill()
t.fillcolor('dodgerblue')
t.begin_fill()

t.setpos(50, 50)

t.left(90)
t.forward(200)
t.left(90)
t.forward(200)
t.left(90)
t.forward(200)
t.left(90)
t.forward(200)

t.end_fill()
t.fillcolor('red')
t.begin_fill()

t.setpos(75, 75)

t.left(90)
t.forward(150)
t.left(90)
t.forward(150)
t.left(90)
t.forward(150)
t.left(90)
t.forward(150)

t.end_fill()
t.fillcolor('cyan')
t.begin_fill()

t.setpos(100, 100)

t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)
t.left(90)
t.forward(100)

t.end_fill()