I've played this quite a few days running now, and my 'brain age' has been steadily getting lower - but whether that's because I'm getting cleverer or because I'm getting used to the puzzles, I'm not sure. It's a great little toy, and very diverting. My best brain age has been 20, but that was a one-off ...
The sudoku puzzles included are excellent. The user interface is so easy to use, and they're clearly split into basic and intermediate levels. Some of the intermediate levels have had me stuck once or twice, but there's nothing unsolvable about them. I've completed 22% now.
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