Puzzle games for adults on Switch offer complex, thought-provoking challenges. 'The Witness' is an open-world puzzle game with hundreds of line-drawing puzzles that test logic, observation, and pattern recognition, set on a visually stunning island. 'Portal 2' is a hilarious puzzle game where you use portals to navigate test chambers, with a co-op mode that requires precise communication and teamwork. 'Monument Valley 2' uses optical illusions and perspective shifts to create mind-bending puzzles, paired with a heartfelt story about motherhood. 'Lumosity: Brain Training' offers puzzles designed by neuroscientists to improve memory, attention, and problem-solving skills. 'Sudoku Master' has thousands of Sudoku puzzles of varying difficulty, from easy to expert, perfect for relaxing yet stimulating gameplay.