Originally wrote this for GMPuzzles, but decided I didn't like it enough. This was the first time I really had to struggle to get the givens to work out given so many constraints on the geometry of the grid and the logical theme -- it felt like everything I tried broke in some way. Thus, while I think there are some interesting ideas in here, I had to sacrifice basically all of the more interesting logic to make it work uniquely (and without stupidly easy bypasses).
Variation of standard Cave rules. Each clue represents the product of the number of row cells visible
(including the cell itself) with the number of column cells visible
(including the cell itself).
Online interface