That puzzle idea from the other day

[rhu]

When I woke up this morning, I had an idea that I think will make my puzzle idea of the other day work. It'll be a bit less ambitious, but also more accessible to a wider range of solvers, while still (I hope) fun and with the same "a-ha!" moment. So thanks to all who asked me to share it, but you'll just have to wait bwah hah hah and see. :-)