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This plugin is a nice idea. It is now 7 years old but it still works on NB8. That is pretty good.
It could do with a bit of a window dressing: The board is not very visible. I would love to have color differentiation between the given numbers and those that the player types in. A validation of a bad number that conflicts with another number should be present. There is no "step undo". As it stands it is not very playable. It could be a nice starting point for someone learning NB Plugin development but there is no github repository linked.