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An essay on rebuilding three Touhou games with agents: what verification looks like, where agents help, and how knowledge carries from one project to the next.

Reconstructs a PC-98 DOS shooter's code, matching its 16-bit routines to readable C++ and the historical compiler's output.

Inspects a DownUnderCTF binary, finds its checking functions, turns the masks and sums into equations and confirms the solved flag against the original program.

Rebuilds the 1990s Breakout game's logic in C and checks it against the original x86 program with differential tests and byte-exact compiled output.

Follows the six-digit code calculation of the open-source Aegis authenticator through its released Android APK, and uses a demo clock to show why the code changes every 30 seconds.

Traces a page-facing API in Notion's packaged JavaScript through its IPC wrappers to the system clipboard and shows how an HTML marker links rich block data to a copy.

Reverse engineer anything with agents, from app behavior down to native binaries.