If you like the Friday Puzzles, I have produced a kindle ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available in the UK here and USA here. There is also a blog page containing 101 of the puzzles here.
So, onto this weeks puzzle…..
You are shown the four pieces of cardboard shown below.
You are told that each one is either red or green on one side, and that each one has either a circle or a square on the other side.
Which one(s) must you pick up and turn over in order to have sufficient information to answer the question: Does every red one have a square on its other side?
As ever, please do NOT post your answers, but do feel free to say if you think you have solved it and how long it took. Answer on Monday!