sudoku.coach

sudoku.coach is the ultimate Sudoku app/website.

This app is 100% free:
* there are no features behind a paywall. Everyone can do anything!
* there are no advertisements whatsoever!

IMPORTANT:
This app is a wrapper around the website. You will need to open the app with an active Internet connection once, so that it can be used offline afterwards indefinitely. When you see the "Webapp installed" message, you're good to go.

Countless features:
* the campaign mode offers hundreds of hours of gameplay while learning the most useful Sudoku techniques one after another
* teaches 40+ Sudoku techniques
* has lots of options (different notation systems, themes, etc.)
* offers high quality puzzles in 11 difficulties
* supports dozens of Sudoku variants (killer sudoku, x-sudoku, consecudoku, entropy, ...)
* has a powerful solver which can show you step-by-step what techniques are needed to solve a Sudoku
* has one of the best hint systems
* has a powerful puzzle construction tool
* offers LOTS of drawing tools to help you solve a Sudoku
* allows users to share their self-made Sudokus
* has a large community to help you with puzzles
* extensive lessons, print mode, themed collections, practice mode, and so much more...

Have fun with my app and have a great day!

Cheers,
Jan