// screenshots
// in motion
Build a computer from scratch: from relays and a single NAND gate to a 16-bit pipelined CPU with branch prediction and cache. 196 puzzles, your own assembler, robots in a maze and games on I/O ports — all running on circuits you wired yourself.
// screenshots
// in motion
// what's inside
Start with a single NAND. Build NOT, AND, OR, then adders, latches, registers, memory — and finally a processor that runs your own programs. Every part becomes the building block of the next.
Relays, transistors, microcircuits, microprocessors — walk the real history of how computers were built, one era at a time.
A built-in code editor, a HEX view, readable errors. Write assembly that runs on the CPU you wired by hand.
Circuits simulate at the gate level, so even a big processor runs live. Pause, step, or let it rip.
A built-in level editor: design your own puzzles with reference solutions, tests and hints.
Across six eras. No ready-made parts — everything is made from what you built before, era by era.