Some issues
You have to put in all the X’s for it to register correct. Controls are a little finicky. A few visual bugs.
Response from developer
In Normal Mode, completing a row or column automatically marks the remaining cells with an 'X'. In Focus Mode, you must manually mark 'X's until the puzzle is complete; the puzzle is only considered finished when every cell is filled correctly. You can change the game mode in the settings menu.
Relaxing
Get rid of the adds
Response from developer
Thank you for playing the game.