Say "Alexa open Dual N Back" to begin. If your Alexa-enabled device doesn't have a screen, you can use the companion application to view the cards.
On difficulty level 1 (default), you're listening out for a consecutively repeated letter and watching for a consecutively repeated image. For example, if you heard "X", followed by another "X" but with a different image, you would say "Letter. If you had seen the exact same image twice in a row but heard a different letter, you would just say "Image." If both the Image and the Letter had appeared twice in a row, you would say "Both". Or, if neither Image or the Letter appeared twice in a row, you would say "Neither."
You can say "Change the difficulty to 2" to increase the N-Back challenge (ranging from 1 - 10.) You can also say "Change the Size to Medium" to increase the size of the visual cue (ranging from small, medium, and large.)
For difficulty 2, you're listening out for a repeated letter as it was heard 2 letters ago, and you're watching for an image that was repeated 2 images ago.
The game is scored after 25 N-Back challenges.
You can say "Exit" to leave the game.
The source code is available at https://github.com/rtbz/alexa-dual-n-back
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