By Louise Mayor
Twenty-six days ago we launched the Physics World at 25 Puzzle with the first and easiest of the five puzzles in the series. Today we announced the fifth, final and most fiendish puzzle of all.
Did anyone out there manage to bag the whole set? See where you rank by entering all five answers, in sequential order and as a single string of text with no spaces, in the box below.
However you do, we sincerely hope you enjoy trying the puzzles.
For any frustrated puzzlers out there who are at the end of their tether and want to know the answers, do not fret: the solutions will be revealed in the January 2014 issue of Physics World.
Physics World is available online and through our apps to all members of the Institute of Physics, with IOPimembership costing just £15, €20 or $25 a year.
We will also announce the answers on this blog in January – to make sure you get a reminder, you can sign up to our newswire, which each week highlights the latest content on physicsworld.com.
Anyone for any more? GCHQ also created the Codebreaker Challenge for the London Science Museum – an interactive set of puzzles that we highly recommend.
