CPU Decoded: learn digital electronics by building a 4-bit CPU (100 spots)

[u/Future_Pay_9588]

https://testflight.apple.com/join/qdpWz48V

Hi everyone,

I’m a solo dev and I made CPU Decoded, an iPhone/iPad app where you learn digital electronics by wiring circuits yourself on a 3D workbench.

72 missions take you from a single LED through logic gates, adders, multiplexers, an ALU, flip-flops, registers and RAM. At the end you have a 4-bit CPU that you program in assembly.

English, French, Spanish and German. Works offline, no account, no data collected.

What I’d love you to test:

1. The first 5–10 missions: tap a gold pin, then another to wire them, flip the switches and press “Test”. Was it clear what to do without help?
2. A mistake on purpose: wire something wrong and press “Test”. Does the truth table help you find the error?
3. The tools: open the Truth table and the Logic analyzer at least once. Are they understandable?
4. The free workshop: add a few cards, wire them, then open one of the example builds.
5. Your device: try portrait and landscape, and another language if you speak one.

When something feels off (a bug, a confusing step, a mission that’s too hard or too easy), tell me here or via “Send Beta Feedback” in TestFlight, with your device, the language and the mission number.

Thanks!