Brain Games - Boost memory power with free brain games
Ticket to Ride - Ticket to Ride is a Turn-based Strategy, Puzzle, Board, Co-op, Single, and Multiplayer video game created and published by Days of Wonder and Asmodee Digital.
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Puzzle Strike - Puzzle Strike is a Puzzle, Board, Single and Multiplayer video game created and published by Sirlin Games.
Pixelogic - Daily Picross - Nonogram logic game with 5000+ puzzles and a daily puzzle
Streets of Chaos - Streets of Chaos is a Puzzle, Tactical, Turn-based Strategy and Single-player Simulation created by SimProse Studios.