Guides
How to play XXI, how to find the long path to 21, what XXI means, and the other daily puzzle games worth a morning.
How to Play XXI: Rules, Scoring and Your First Grid
XXI is a free daily number puzzle: draw one path through a 4×4 grid that adds up to exactly 21. The rules, how scoring works, and a worked first grid.
XXI Strategy: How to Find the Long Path to 21
Finding a 3-tile 21 is luck. Finding the 7- or 8-tile answer is technique. Five habits that reliably turn a short XXI path into a long one.
What Does XXI Mean? 21 in Roman Numerals, and Why We Named a Puzzle After It
XXI is 21 in Roman numerals: X (10) + X (10) + I (1). How Roman numerals add up, where 21 shows up in the world, and why a daily number puzzle took the name.
Daily Puzzle Games Like Wordle: The Number and Logic Edition
Finished Wordle and want another one-a-day puzzle? The best daily number and logic games — what each one is, how long it takes, and what makes it stick.