Foundry-5

Foundry-5 is a free browser puzzle game that teaches you real RISC-V (RV32I) assembly 

  language — not a toy or pseudo-code, the actual 32-bit instruction set. You play by

  writing bare-metal firmware to bring a dead automated factory back online, one system at

  a time.

  Each puzzle hands you a small machine — an LED, a sensor, a frame buffer, a motor — and

  asks you to make it work by writing assembly. Your code runs on a built-in RISC-V CPU

  emulator with a live view of every register, every byte of memory, and every instruction

  as it executes. Watch the machine think, step by step.

  What you'll learn

  - Registers and how data moves through a CPU

  - Memory: loads, stores, addressing, and buffers

  - Loops, branches, and control flow in assembly

  - The calling convention — functions, the stack, recursion

  - Bit manipulation: masks, flags, packing and unpacking

  - SIMD / vector instructions and real codec kernels

  - How computer architecture actually fits together at the lowest level