Regex Crossword is a puzzle game where you must solve a crossword consisting of clues given in the form of regular expressions.
The idea to make Regex Crossword came from the MIT Mystery Hunt, which featured a very difficult multi-dimensional regular expression crossword. I thought this was a really fun variation on the normal crossword and soduku-like puzzles, and decided to create a game with more puzzles and easier difficulty levels, so newcomers could also have a fun way to learn regular expressions.
Players can login with their social accounts (Facebook, Twitter, Google and Microsoft Live), to save their progress and earn achievements for completing puzzles. Security is handled by authenticating with the social networks on the front-end and then validating the tokens in the API and exchanging JSON Web Tokens.