Logic Puzzles Daily - Logic Puzzles Daily app comes up with features to help you in taking challenges so you can clear levels after levels of brain teasers.

Brain Games - Boost memory power with free brain games

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.

Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.

LetterPop - LetterPop is a service that allows you to easily create online newsletters with text and images and...

Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle