One Clue Crossword - One Clue Crossword app allows users to access an extensive collection of more than 1000 different puzzles in order to exercise their brains on a daily basis.

HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

Words in Word - Words in Word app provides features through which you can clear levels by making new words using letters of other words.

iMocha - Make intelligent talent decisions.

Crossword Puzzle Free - Crossword Puzzle Free is an app by Redstone Games that provides you with a variety of different puzzles according to various difficulty levels such as easy, medium, hard, and pro, etc.

Codility - Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.