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First select the cell you'd like to write a note in. Then tap and hold on the number button and a note will appear. You can write multiple notes in each cell.
To reset only time-based high scores, tap the Records button in the main menu, then tap the Delete button in the upper right corner.
To reset all records, tap the Settings button in the main menu, then choose the Reset Everything option. This will clear all high scores and reset your progress.