Sudoku Challenge- Free Classic Sudoku Puzzles by JS2021 Games is a free puzzle game available on Android devices. The game has an intuitive interface, easy-to-control layout, and a balanced difficulty level for beginners and advanced players. With four game modes and thousands of free Sudoku puzzles, this game is perfect for those who want to kill time while also exercising their brain.

In addition to the classic game mode, the app offers daily challenges to collect trophies and track progress through statistics. The game also has useful features like undo, erase, note-taking, and help, making it easier for players to find a breakthrough when they encounter difficulties. The game also includes a timer, auto-save, highlight, highlight error values, and automatically delete notes features.

Overall, Sudoku Challenge- Free Classic Sudoku Puzzles is a great puzzle game that offers a fun and challenging experience for players of all levels. Whether you're a beginner or an advanced Sudoku player, this game has something for everyone.