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

stop using keyboard.isDown

It doesn't work on Android, and it's not much work to avoid.

Created by  Kartik K. Agaram  on September 4, 2023
KE4T63TS3DEBC6YKTQNROAPIC7YFBAE264YRTEZLZI5I7KFBZV6AC
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