I wanted to help my mom keep her mind busy, because she started having memory problems a few years after retiring. So I made a game that is like Sudoku but use

I wanted to help my mom keep her mind busy, because she started having memory problems a few years after retiring. So I made a game that is like Sudoku but uses 9-letter words instead of digits. Technically, it’s just a simple substitution. But playing it requires much more mental effort than you’d expect. Due to the fact that letters are shuffled, so it’s not easy to keep track of them. I’ve made an app, a web version and a paper book. iOS app: https://apps.apple.com/ch/app/word-sudoku-pro/id6472858788?l=en-GB https://apps.apple.com/ch/app/word-sudoku-pro/id6472858788?l... Website: https://wordsudoku.win https://wordsudoku.win Paper book: https://www.amazon.com/dp/B09GZDT5JQ https://www.amazon.com/dp/B09GZDT5JQ