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#Summle #7: 3/5 = = =

I like it. Some UX tweaks would be nice, maybe an undo, a clear all, and perhaps some helpful focus shifting (of which tile is being intended for a click) depending on context.

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Another thought, having an in-app calculator (so one could free calculate factors of an arbitrary number) might generate interesting data to see the approaches your users take? I could see how that might be interesting data for cognitive mathematics research.

The undo function is in the works.. to clear all you can refresh the page (or click the logo). There is an effect when a tile is filled but perhaps it needs to be more dramatic.

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