maincode.py

from turtle import position
from ursina import*
from ursina.prefabs.first_person_controller import FirstPersonController

app = Ursina()
Sky()
player = FirstPersonController()

boxes = []
for n in range(8):
    for k in range(8):
        box = Button(
            parent = scene,
            model = 'cube',
            origin_y= 0.5,
            texture = 'white_cube',
            color= color.orange,
            hightlight_color = color.lime,
            position = (k, 0, n)
        )
        boxes.append(box)

    def input(key):
        for box in boxes:
            if box.hovered:
                if key== 'left mouse down':
                    newBox = Button(
                        parent = scene,
                        model = 'cube',
                        origin_y= 0.5,
                        texture = 'white_cube',
                        color= color.orange,
                        hightlight_color = color.lime,
                        position = box.position + mouse.normal
                    )
                    boxes.append(newBox)
                if key== 'right mouse down':
                    boxes.remove(box)
                    destroy(box)

app.run()