Make a computer that can count to 127 (you will need to reload a lot) using a register of 7 bits. Begin with the image and use the red side.
It’s easy, at the beginning, when you have the answer. For my part, I struggled a lot but I percevered until I was proud of myself. Then I asked my family to solve it in turn but without success. I was glad to see their many failures. Anyway, I recommend this challenging challenge