About

I'm a mobile developer. I've been playing Sudoku for sixteen years, and for most of them I was stuck exactly where most players get stuck: comfortable with the intermediate puzzles, bouncing off the hard ones, and unable to find an app that would actually teach me the way through.

Every app I tried treated puzzles as a difficulty commodity — endless random grids labeled Easy through Expert. None of them taught the techniques that crack the hard ones. The good explanations lived in forum posts and pencil-and-paper diagrams, not in something you could hold in your hand and practice on.

So I started sketching the app I wished existed. That was 2009. It took a long time — most of it spent on the part nobody sees: a solver that recognizes 79 named techniques the way an expert would, so every puzzle could be classified by the move it teaches and the hints could explain why, not just what. Sudoku Collector is the result. It's built for the player I was — the one who'd plateaued and wanted a real path through the hard stuff.

It has no ads, no accounts, no tracking, and no analytics, because I built it as the thing I wanted to use, not a funnel. If you've hit the same wall, maybe it helps you through it too.

— Sravan

Questions, feedback, or a puzzle that beat you? sudoku-support@sravannerella.com.