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It's a famous brain training as N-back. More info is available in Wikipedia.
This is a brain training game.
Memory the current numerical calculation, and answer the one shown N steps earlier in the sequence.
If all your answers are correct, next stage will be opened.
See also
Wikipedia - N-back
http://en.wikipedia.org/wiki/N-back
What's New in the Latest Version 1.01
Last updated on Jul 22, 2015
1.01 updated inner library.
1.00 was published.
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N-Back Calculation
1.01 by silight
Jul 22, 2015