Right at the very top of the article: > Let me tell you the story so far; the process, obstacles, and solutions involved in making a roguelike dungeon crawler

Right at the very top of the article: > Let me tell you the story so far; the process, obstacles, and solutions involved in making a roguelike dungeon crawler playable on systems like the Commodore 64, Commodore PET, and even more constrained machines. Javascript is not running on a Commodore 64 with decent performance.