Hopefully it is both fun and challenging, while at the same time educational about some of the fundamental principles of how a CPU works.
It still lack some explanatory texts, but is should be playable as it is.
It is inspired by the first chapters of the brilliant Nand2tetris course (and I have gotten permission to use the same general CPU design). My hope is this is more accessible since it is web-based and does not require any text-based coding or CS background.