Original BlackCat_Hacker by Zach End, MIT. Source: https://github.com/Beanminchild/BlackCat_Hacker/tree/0e669da78e3ffdb83b201d98f37861e064d9454f
Modified static edition: silent (all music/transcriptions removed), fixed 60Hz pauseable gameplay clock and timers, reliable scoring under rapid typing, a reachable lower shelf at x540/y450, responsive fixed-ratio room, pointer controls, guide, new-week control and device-local best score. Original stealth/cup/typing/weekly report systems and procedural Canvas art preserved.