The NumFall blog
Number puzzles, logic and the order of moves
Solving techniques for 4×4, 6×6 and 9×9 grids, logic puzzle rules, brain game habits and casual puzzle gaming on iPhone and iPad.
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Brain and habits
Short puzzle breaks at work: do they help you refocus?
Do short puzzle breaks at work help attention? A look at studies on micro-breaks, workload, mood and mind-wandering, plus how a 4x4 board fits five -
Brain and habits
Puzzles and brain health in later life: what studies found
What studies found on puzzles and brain health in later life, from crossword research in 2011 to a 78-week trial in 2022, and what each design can show. -
Brain and habits
Number puzzles for seniors: what to try first and why
Number puzzles for seniors: which board size to start on, how long to play each day, and what a 2025 study of 19,000 adults did and did not find. -
Brain and habits
Are logic puzzles good for older adults? what studies show
Are logic puzzles good for older adults? See what a 2025 study of 19,000 people and a 2021 abstract found, and what those results do not show. -
Brain and habits
Do number puzzles help memory? evidence from studies
Do number puzzles help memory? See what the Exeter, BMJ and Hong Kong studies measured, and what they do and do not show about memory and aging. -
Brain and habits
Five minute puzzle routine for a focus break at work
A five minute puzzle routine for a work break: scan a 4x4 grid by rows, columns and boxes, write only forced numbers, and stop when the timer rings.