Daily Puzzle Only
You can only play the daily puzzle none of the challenges or the type your own options work. I have tried to contact the developer and heard nothing.
Not enough ratings yet to assess Inkgrid Sudoku.
Inkgrid Sudoku appears legitimate, with a few gaps. AppsHunter Legitimacy Score for Inkgrid Sudoku is 65/100.
Based on 65 of 100 points across 7 verification signals from App Store and developer data.