Brain training, mental math & focus
Honest, plain-English guides to keep your mind sharp — plus tips and strategy for our games. New articles are on the way.
How to improve your mental math
The "make ten" trick and five simple strategies anyone can learn — plus a free number game to practice with.
Brain games for seniors
Ten free, no-download games to keep your mind active — and the honest answer on whether they really work.
How to get better at Sudoku
Stuck on the hard ones? Learn scanning, pencil marks, naked pairs, and hidden singles — in the right order.
How to play Killer Sudoku
Cages, the 45 rule, and how to solve it like normal Sudoku — a step-by-step guide for adults.
Mental multiplication tricks
Six tricks — ×11, ×9, ×5, squaring, and doubling — that make multiplying in your head click for adults.
Brain games like Sudoku
Seven free number and logic puzzles in the same family as Sudoku — plus one you can play right now.
How to solve Kakuro
Magic number combinations and cross-referencing explained — a beginner's guide to cracking the Kakuro grid.
How to solve Nonograms
The overlap trick, marking blanks with X, and cross-referencing — a step-by-step guide for adults new to picture logic puzzles.
Mental subtraction tricks
Four tricks — count up, bridge through 10, left to right, round and adjust — that skip paper borrowing and let you subtract fast in your head.
Mental division tricks
Four tricks — break the dividend, halve for ÷4 and ÷8, double for ÷5, split the divisor — that skip long division and let you divide fast in your head.
Number games for seniors
Eight free number games seniors can play in a browser — no sign-up, no download. Sudoku, Kakuro, Sumplete, Make 10, and more. Start easy and play at your own pace.
While the articles are being written, why not play Make 10?