Hi,
If it is easy for you to add that feature than please add it, we can limit the pages and search, we can use this not only for puzzles but also we can define any page ranges we are interested in.
For puzzles the pages ranges are below
71 - 26235369349275806744 to 52470738698551613486
72 - 52470738698551613487 to 104941477397103226971
73 - 104941477397103226972 to 209882954794206453942
74 - 209882954794206453943 to 419765909588412907884
75 - 419765909588412907885 to 839531819176825815769