I was editor of Games and Puzzles magazine many years ago. Now have a website word-flip.com with word and number puzzles - from easy to ones that few can solve! Completely free.
Have written a dozen books on games and puzzles as well and have one in the pipeline on Word-Flips.
A couple of posers for puzzlers. Change GLOBED to JURIST, changing one letter at a time OR making an anagram. Needs 10 changes. All words would be allowed, for example, on COUNTDOWN.
Get from 54401 to 62827 in six changes, changing one digit at a time. Easy? Not when all numbers have to be primes. This time "anagrams" are not allowed!
Have lots more like that but only if readers like them!
Great site by the way!