The best I got is this,
https://leetcode.com/problems/word-break/
You'll have to provide the dictionary yourself in text form and it has to be <1000 characters. But it may be enough to list just the most common words (the, in, etc.) and so those would have spaces added before/after, leaving less to do by eye after.
The problem and a solution is contained in this book (look for unconcatenate or respace):
Hashcat. But if you want to find a solution before all mankind or even the universe comes to an end you'll need at least roughly an idea what has been hashed (ie. length of input, charset, salted y/n etc.).
I'd recommend searching all available hash databanks first before even trying hashcat. Usually the solutions for those games are quite simple and therefore chances are good the hash is already in a db like
So the premise of the story is that an author travels the world for 7 years and then out of nowhere releases a book encrypted in a secret code and disappears. The first book in the series is an action adventure novel about solving it. The second book is this one pictured here. It is the “actual” book from the story and the puzzle is real. The novel has all of the clues for solving it.
Novel: Bell's Codex https://www.amazon.com/dp/B09DJCLR34/ref=cm_sw_r_cp_api_glt_fabc_F80W214PG9W2M12734JS
Code Book: my magnum opus (Bell's Codex) https://www.amazon.com/dp/B09DMW6NLQ/ref=cm_sw_r_cp_api_glt_fabc_C7H894A240E3SB8YG1S1