I've wanted to study Svelte for some time now, but I didn't have any project for it. I play Sudoku a lot, and even with good apps I didn't found one with the settings I needed (like disabled error messages).
👉 https://sudoku.com: A great website I always use to practice.
👉 https://github.com/robatron/sudoku.js: This repository gave me the board creation algorithm. It helped a lot.