Sudoku of the Day (legacy)

Please note that we will soon be retiring this version of the app; you can find the newer version here (existing users will be able to carry over their purchases):
https://apps.apple.com/gb/app/sudoku-of-the-day-hd/id425161413
Get the popular Sudoku of the Day daily puzzle challenge FREE for your iPhone or iPad! Every day download the featured puzzle at your chosen difficulty level, complete it and submit your time to see how you compare with other players worldwide. More than 30,000 unique players every week are already enjoying this daily Sudoku challenge. Can you top the leaderboards?
Sudoku of the Day includes for Free:
* 6 competitive puzzles each day ranging from Beginner difficulty through to Diabolical
* Tutorial built-in to show you how to play if you're new to Sudoku
* Unlimited randomly generated puzzles
* Enter your own puzzle to solve in the game
* Manual or automatic pencil marks
* Smart hints - tap to get a hint, tap again for a bigger hint etc. Ideal for improving your Sudoku skills
* Hold & highlight - tap and hold a specific number or pencilmark on the number bar below the puzzle to see all instances of the number in the grid.
Sudoku Of The Day is supported by showing an ad at the end of most games; if you want to remove these you can make a simple in-app purchase.
* Daily puzzle download requires data connection *