CrosswordLinks.com
Crossword at CrosswordLinks.com - Crossword directory with categorized links to Crossword sites, including rules, articles, software, news, playsites, leagues, tournaments and more.
http://www.crosswordlinks.com/
The Crossword Centre
Derek Harrison's centre for crossword puzzle resources. Challenging cryptic crosswords, free crossword software, competitions and tough puzzles
http://www.crossword.org.uk/
Had To Play On
A community based site for puzzlers and riddlers alike. We have competitions, challenges, awards, a help centre, forums and games.
https://www.hadtoplayon.com/
Archimedes' Laboratory
Mind and Visual Puzzles and Activities that enhance critical, logical,and creative thinking skills, and keep your brain active!
https://www.archimedes-lab.org/
Eluzions Illusions
Entertainment, Games, Puzzles, Brain Teasers - Eluzions. Featuring all sorts of games, optical illusions, puzzles, trivia, mazes, and magic tricks.
http://eluzions.com/