REA case studies.
Game reconstruction, Electron analysis and a CTF challenge, with code, figures and checked results.
CTF · Native analysis
Solve a CTF flag checker
Inspect an easy DownUnderCTF challenge with REA. Find its checking functions, turn masks and sums into equations, then verify the solved flag with the original program.
Native · Reconstruction
DX-Ball's sound-pan calculation
Recover a sound-pan calculation from a 1996 Windows game. REA's instructions, caller references and numeric constants lead to a small C function, checked against the original behavior and all 63 compiled bytes.
Electron · Feature tracing
How Notion copies text and HTML
Trace a page-facing API through Notion's packaged JavaScript. Follow its IPC wrappers to the system clipboard, then see how a small HTML marker keeps rich block data connected to a copy.
PC-98 DOS · Reconstruction
How TH04 aims a ring of bullets
Inspect the original 16-bit angle helper with REA. Match its multiply, divide and coordinate operations to readable C++, then see how they produce a ring aimed at the player.
Step-by-step guides
The guides walk through a native calculation, an Electron export and a browser request. Each starts with a prompt and a concrete target.
Read the guides