The app is very stylishly designed, with a soothing background that changes colour automatically (but only if you want it to - you can switch this off if it’s too distracting). There are enough configuration options to elevate this above many of the basic apps available - for example, the Rapid option for adding both solutions and notes speeds things up nicely. You can also switch off the timer if you just want a relaxed game. There are a few things it doesn’t do that I get in my other sudoku apps - for example, highlighting all incidences of a number on the board does not also highlight that number in the candidates, and the Hint button simply solves the selected cell rather than guiding you towards the solution step by step. For those reasons this app is not one I use all the time, as I prefer apps that have the capacity to teach me how to play the game in a progressive way. However, the developer seems very responsive to feedback, so other features may be introduced in the future.
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