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We played counters in the middle - we thought it can be very tricky but when you get closer it gets so much easier.
Firstly we guessed the first counter and then the last counter. After we got them right we had some counters in front of us. we used them to guess what some of the other were - you would be suprised about how much easier this is.
Good questions: has it got a pattern? how many colours have you used? how many counters are there? How many blue counters have you used?
Less useful questions: is it red?

secondly you have to see if there is a pattern if it does not have one all you need to do is ask ask some questions about it. if there is a pattern just experiment with the counters in front.