Sudoku App

I wanted to test out svelte and had an idea of creating a Sudoku app with features I wanted in it so I started working on it.
Website

Features

• Highlighting related cells
• Notes (I learned a css trick with creating these little ones)
• Highlighting same numbers and notes on the grid
• Three difficulty levels
• Three Daily puzzles
• Two numbers set (English and Persian)
• Timer and toggling it on/off
• Redo and Undo actions
• Mistake checker
• Remaining numbers indicators
• Removing unneeded notes on filling a cell
• Selecting previous days' puzzles
• Hints (wanna figure out how to implement advanced hints)