A short stretch of focus
Focus here means a quiet stretch of attention. You look at one board. You look for the next forced mark. You do not split the sit.
Ten minutes can be enough. So can a longer evening. The length is yours. A short stretch is still a real sit.
DIGIGMA does not treat a puzzle as a test of how sharp you are. It does not promise anything about memory or mood. The board is just a board.
If you want that stretch, open a game from Home, silence the rest of the screen, and stay until one more cell is certain.