Better Sudoku: Killer, Themes

I play a lot of sudoku. After trying most of the apps out there I still hadn't found one that had everything I wanted, so I built it.

Classic 9x9 sudoku.
Killer sudoku, including 4x4 grids for a quick round.
A daily challenge with a new random puzzle every day.
Light mode and dark mode, both done properly.
Customize the parts that matter to you.

The interface is where most of my time went. Every screen was designed to stay out of your way. While you play, the navigation bar disappears so your thumb can reach the bottom rows without stretching. Small things like that add up over hundreds of puzzles.

New: A battle mode where you challenge friends live, a rating system to track how you stack up.

If you play sudoku every day, this is the app I wanted to exist.