All Tricks

Fill a 3×3 grid so every line shares one magic sum.

The 'dull' taxi number Ramanujan saw was the smallest sum of two cubes two ways.

A 14th-century cattle puzzle hides a cousin of the Fibonacci sequence.

Four triangles and a tilted square prove Pythagoras at a glance.

A 1,000-year-old temple carving where every line of four sums to 34.

Light and heavy syllables of Sanskrit poetry are a binary code — read off the number.

Centuries before Newton, Kerala's Madhava summed an infinite series to find π.

The digital roots of the times-tables fold into a 9×9 grid of striking symmetry.

One angle at the centre quietly fixes the angle out at the rim.

Pick any angle, divide sin by cos of its complement — the answer is always one.

Find the buried chest from a single distance clue — geometry pins it exactly.

Hop a token by any vectors — its final colour is fixed before it moves.

A glass's rim is far longer around than the glass looks tall — π makes sure of it.

Cut a square, rebuild it as a rectangle — and one unit of area mysteriously vanishes.

One grain on square one, doubling each square — the count explodes past belief.

Repeat any digit three times, divide by its triple — you always land on 37.

Fill a 3×3 grid so every line shares one magic sum.

The 'dull' taxi number Ramanujan saw was the smallest sum of two cubes two ways.

A 14th-century cattle puzzle hides a cousin of the Fibonacci sequence.

Four triangles and a tilted square prove Pythagoras at a glance.

A 1,000-year-old temple carving where every line of four sums to 34.

Light and heavy syllables of Sanskrit poetry are a binary code — read off the number.

Centuries before Newton, Kerala's Madhava summed an infinite series to find π.

The digital roots of the times-tables fold into a 9×9 grid of striking symmetry.