Play in your browser, on this machine
DIGIGMA runs in the browser you already have. Open the site, pick a game, and start. There is nothing to install and no account to make.
The board lives on this machine. An unfinished puzzle and the Solved list stay here, in this browser. Close the tab; they are still here when you come back the same way.
You can play at a desk or on a phone. The rules do not change. Tap a cell, place a mark, and sit with the board until the next move is forced.
A first board is easy to find. Open Sudoku, Star Battle, or Binary Puzzle on Beginner, or start from Home.