# Puzzles

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

fractions functions parabolas square numbers speed geometry rectangles integration number crosswords coordinates unit fractions perfect numbers proportion routes hexagons wordplay planes probabilty factors irreducible numbers addition dates 2d shapes indices numbers cube numbers graphs cards sums odd numbers time differentiation division squares spheres surds advent perimeter digits angles scales ellipses crossnumbers regular shapes money taxicab geometry floors complex numbers quadratics chocolate ave cryptic crossnumbers chess games prime numbers lines mean star numbers integers square roots shape pascal's triangle doubling dodecagons shapes cryptic clues logic triangle numbers rugby means percentages sequences books circles grids triangles averages menace remainders chalkdust crossnumber trigonometry 3d shapes symmetry probability partitions christmas calculus multiples sport colouring dice balancing multiplication volume bases coins clocks sum to infinity people maths area algebra factorials palindromes arrows polygons folding tube maps## 3 December

In August, I wrote about MENACE, a machine learning robot built from matchboxes which plays noughts and crosses. How many matchboxes are needed to build MENACE?