The puzzle can be solved with the help of small clue-numbers which are either placed on the border lines between selected pairs of neighbouring squares of the grid or placed after slash marks on the intersections between two diagonally adjacent squares.
An introduction to the binomial coefficient, and exploration of some of the formulae it satisfies.
This article for teachers suggests activities based on pegboards, from pattern generation to finding all possible triangles, for example.
Jennie tried the Approaching Midnight game and wondered if it matters whether you go first or second.
Bernard played Approaching Midnight and wondered whether the start time affects who wins.
Liz played Approaching Midnight and wondered how changing the smallest step size affects the game.
Read this article to find out more about the inspiration for NRICH's game, Phiddlywinks.
