NFHS R2-S10: Basket Size, Material
ART. 1: Each basket shall consist of a single metal ring, 18 inches in inside diameter, its flange and braces, and a white-cord 12-mesh net, 15 to 18 inches in length, suspended from beneath the ring.
ART. 2: Each ring shall not be more than 5/8 inch in diameter, with the
possible addition of small-gauge loops on the bottom edge for attaching a 12-
mesh net. The ring and its attaching flange and braces shall be bright orange in color.
ART. 3: The cord of the net shall be not less than 120-thread nor more than 144-thread twine, or plastic material of comparable dimensions with no
additional extensions. It shall be constructed to momentarily check the ball as it passes through.
NCAA R2-S13: Basket Size, Material
ART. 1: Each basket shall consist of a single metal ring, 18 inches in inside diameter, its flange and braces, and a white-cord 12-mesh net, 15 to 18 inches in length, suspended from beneath the ring.
ART. 2: Each ring shall not be more than 5/8 inch in diameter, with the
possible addition of small-gauge loops on the under-edge or a smaller ring
located directly under the required ring for attaching a 12-mesh net. The ring and its attaching flange and braces shall be bright orange in color.
ART. 3: The cord of the net shall be not less than 120-thread nor more than 144-thread twine, or plastic material of comparable dimensions with no
additional extensions. It shall be constructed to momentarily check the ball as it passes through.
Based upon the sentence that I have highlighted in red, I am going to go out on a limb and say that the game can not be played unless nets are attached to the rims.
MTD, Sr.