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@Local Minimum: Great suggestions.  I was thinking of dropping the shapes around the numbers.  I originally made them to help with color-blindness, but then I dropped that, yet left in the shapes.

Also I think the equation templates, which I thought would help players in the first levels, actually confuse them.  I'll keep thinking how to improve them.

Once you make it past the first few (hard-coded) levels, the rest are procedural, and probably easier, at least for a while.  I'll have to figure out an even slower progression through the various skills (subtract, then multiply, then add/subtract, etc.).

I could score it by equation rather than level.  Up for consideration.