A little sudoku-like app for helping first-graders practice addition

mouse buttons are integers, not strings

Not sure where that idiom comes from or why strings work in some places (auto-coercion?). I picked it up off some example apps. But https://love2d.org/wiki/love.mouse.isDown says it should be an integer.

Created by  Kartik K. Agaram  on June 14, 2022
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