Show HN: A game where you build a GPU

Original Article ↗ Hacker News Discussion ↗

Overall Reception

  • Many commenters find the game “very cool”, fun, and a great hands-on way to learn digital logic and computer architecture.
  • Several players say it finally “clicked” for them how NMOS/PMOS and logic gates relate, or that it’s a great refresher of old EE/CS courses.
  • Others feel it is too difficult or unapproachable for true beginners and could scare off newcomers.

Educational Value & Scope

  • Praised as a strong teaching tool for digital logic, transistors, and CPU architecture, with some calling it better than slides or text.
  • Multiple people want clearer explanations and a gentler ramp: more intro content, explicit acronym expansions (NMOS/PMOS/VDD/GND), and deeper coverage of CMOS logic and why arrangements work.
  • Some feel the NAND-from-transistors step and sense amplifier levels are big difficulty spikes.
  • Several note that, despite the “GPU” framing, current content is mostly CPU/digital-logic; GPU-specific material is planned but not yet fully available.

Gameplay & Difficulty

  • Timed “racer” mini-games (truth tables, hex conversions, DRAM refresh) are widely criticized as stressful, too fast, and not very educational.
  • The developer has made these optional, added difficulty settings, and is considering more changes.
  • Players request:
    • Model solutions or “show answer” after repeated failures.
    • More hints, stepwise reveal, and the ability to skip ahead for advanced users.
    • Explanations attached to shown solutions.

UX, Bugs & Performance

  • Repeated issues: confusing wiring (overlapping/staircase routes), difficulty selecting pins, unclear that grid lines aren’t wires, and discovering deletion/rotation controls.
  • Background grid has been changed to dots; deletion via right-click/keyboard added; some capacitor and level-transition bugs fixed.
  • Some circuits can pass tests with “cheese” or logically dubious designs, leading to doubt about correctness of the simulation.
  • Several users report heavy CPU usage and fan spin-up, especially on laptops.
  • Mobile support is currently poor; many can’t play effectively on phones or tablets.

Comparisons & Related Works

  • Frequently compared to Turing Complete, NANDgame, Silicon Zeroes, Zachtronics titles, etc.
  • Seen as filling a niche by going deeper to the transistor/3‑state level and (eventually) into GPU/DRAM specifics.