Fog of War #35
Description
It should be "easy" enough to add a "dark" flag to each board, and if set, a list of revealed tiles could be tracked.
This could come with a tool menu to cover and reveal tiles, the ability to coat the entire map, and the option to toggle the host-side visibility. Since visible tiles are likely to be the minority in this situation, it's probably best to track a list of uncovered tiles.
The clients would simply need to render terrain with a black background, and the Host would only ever send "uncovered" terrain. Erasing darkness would functionally work as if drawing it, for sending data to the clients.
Maybe, if we're feeling fancy, this menu could also support drawing/erasing with a circle shape.