- Very rarely, the game will still produce unwinnable mazes;
- The build is failing to generate the standard SEGA ROM headers, meaning it may not run on real hardware.
- [Sverx's devkitSMS][https://github.com/sverx/devkitSMS] for access to the Sega Master System hardware;
- [Sverx's PSGlib][https://github.com/sverx/PSGlib] for playing the sound effects;
- [Maxim Zhao's BMP2Tile][https://github.com/maxim-zhao/bmp2tile] for converting the graphics;
- [Furrtek's PSGTalk][https://github.com/furrtek/PSGTalk/tree/958fa824493bae87975684ab544e09bffd48d12b] for converting the sound effects; must be this version; the newer one does not work correctly;
- [Nmn's Monster for 3d fps based on sprites][https://opengameart.org/content/monster-for-3d-fps-based-on-sprites-harkubus] for the main monster;
- [qubodup's Heartbeat (Single sound)][https://opengameart.org/content/heartbeat-single-sound] for the heartbeat sound effect;
- [Michael Klier's Large Monster][https://opengameart.org/content/large-monster] for the death sound effect.