27.03.2023, 10:38
"language is messy" 
, yes you're right. I think you've given yourself quite a challenging task with this rule set and your instruction is clear except for one detail: Does the spelling always start in the cage sum cell? Besides I have two hints, that might be interesting or useful for you:
To your last question: Penpa offers settings for a lot of puzzle types and it's possible to enter letters into a Sudoku grid. I myself didn't manage to find the way to do this, but glum_hippo was kind and created this setting for me: https://tinyurl.com/ImXHerford
In one of my puzzles I combined German number words in Renban areas with the constraint, that the entered numbers have to contain the given letters: S wie Sudoku mit Renban-Gruppen
, yes you're right. I think you've given yourself quite a challenging task with this rule set and your instruction is clear except for one detail: Does the spelling always start in the cage sum cell? Besides I have two hints, that might be interesting or useful for you:To your last question: Penpa offers settings for a lot of puzzle types and it's possible to enter letters into a Sudoku grid. I myself didn't manage to find the way to do this, but glum_hippo was kind and created this setting for me: https://tinyurl.com/ImXHerford
In one of my puzzles I combined German number words in Renban areas with the constraint, that the entered numbers have to contain the given letters: S wie Sudoku mit Renban-Gruppen