Brickit - Use ML to detect what can be built from your pile of legos

Brain Games - Boost memory power with free brain games

DDO: Dungeons and Dragons Online - DDO (Dungeons and Dragons Online) is an Action-Adventure, MMORPG, Puzzle, Open-World and Third-person Video game created by Turbine and published by Atari.

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

Cartoon Network Universe: FusionFall - Cartoon Network Universe: FusionFall is an Action-Adventure, Massively Multiplayer Online Role-playing and Third-person Shooter video game developed by Grigon Entertainment and published by Cartoon Network.

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