Brain Games - Boost memory power with free brain games
A Color Story - The photo app to colourize your life
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
PICTAIL - PICTAIL – Cykik created by JP Brothers Inc.
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
Oilist - The groundbreaking generational art app