3D Visualization of a Computer Built From Logic Gates

Starting from a single logic gate, this build creates a working computer in code from about 277,000 logic gates. It includes a CPU, memory, an assembler, a tiny operating system, and a game that runs on the gates themselves, all presented in 3D. You can zoom down to the gate level and watch signals flow. The author says it ran in ultracode mode for about 30 hours. The screen recording runs about 62 seconds and suits computer-science explainer content.