BP979 is very similar: whether a particular square can be deduced from the rest.
Adjacent-numbered pages: BP1253 BP1254 BP1255 BP1256 BP1257  *  BP1259 BP1260 BP1261 BP1262 BP1263
notso, rules, grid, miniworlds
grid_of_images_with_rule [smaller | same | bigger]
Aaron David Fairbanks
Adjacent-numbered pages: BP1258 BP1259 BP1260 BP1261 BP1262  *  BP1264 BP1265 BP1266 BP1267 BP1268
overriddensolution, left-finite, left-full, right-null, invalid, impossible, funny
[smaller | same | bigger]
Leo Crabbe