Flint shaping uses a process known as knapping, where the aim is to chip off nodules of stone via lithic reduction. I understand it to be quite difficult as it’s easy to mess up a whole project with an incorrect chip, similar to sculpture.
I played a caveman survival shareware game many years ago that had knapping in, you had to click around an outline on a piece of flint trying to keep as close to the outline with random cuts based on how long you held down the mouse button. I think It might have been the first game I played in the survival genre. It was neat as there were no instructions, just you wandering along 2D screens left and right trying to keep your stats up. I seem to recall eating poison berries.