Nature Chemistry | The Sceptical Chymist

Su Doku goes periodic

Su Doku, the number game that is sweeping the world, has been adapted by the Royal Society of Chemistry into a puzzle where each square must have only one of nine elements listed at the bottom of the page. The play is exactly the same as the digit version, except that one contemplates the likes of lanthanum and cerium while one plays. Check it out at


  1. Report this comment

    MIchael Chisnall said:

    A 20×20 square can be decomposed into a 4×5 array of 5×4 arrays (or vice versa). Since there are 20 amino acids in the genetic code (ignoring selenocysteine and pyrrolysine) it should be possible to create genetic sudoku.

  2. Report this comment

    Cate said:

    You’re actually a little behind the times. I got one of these RSC books for Xmas last year… I’m looking forward to volume 3 – the problem in volume 2 with the isomers of heptane was really quite tricky.