Matchsticks and n-dimensional hypercubes February 19, 2015Educationalgebra, challenges, matchsticks, mathematics, solveJames Kennedy Here’s an addictive maths challenge for you to try. It’s separated into four stages: blue (easy); green (medium); yellow (hard); and orange (very hard). k = 3 in each example. If you know the solutions to any of them, write them in the comments section below.