Good Sudoku by Zach Gage promo code

Good Sudoku is a Sudoku game made to teach as much as to entertain. Its hints do not simply fill in a square: they point to the technique that solves the next step, so over time you learn to spot it yourself.

There are tens of thousands of generated puzzles across five difficulty levels, three main modes, and daily puzzles that get harder as the week goes on, with leaderboards. Optional helpers take care of the tedious pencil-mark bookkeeping for players who want to focus on the logic, and you can import puzzles from elsewhere and share them. The game comes from Zach Gage, the designer of several well-loved puzzle games.