Killer Sudoku Is Now in Coffee Sudoku

I've been playing regular Sudoku for years. After a while I noticed I was on autopilot. My fingers knew what to do before my brain caught up. So I added Killer Sudoku to the app.

If you haven't tried it, the idea is simple. The grid still has 9 rows, 9 columns, 9 boxes. But now there are dotted cages, groups of cells that have to add up to a specific number. A cage marked 27 means the numbers inside it total 27. You still can't repeat numbers in a row, column or box, and you can't repeat them inside a cage either. Same game, one new rule. Changes everything.

I had to slow down. In regular Sudoku I can usually scan a row and spot where a 7 goes in a few seconds. Killer made me stop and actually do arithmetic. Which three numbers add up to 15? Can I put a 9 here if the cage only totals 12? My brain was doing sums and logic at the same time, which is not something I'm naturally good at. The first hard puzzle took me twenty minutes. I didn't mind.

There are four difficulty levels. Easy cages are small, two or three cells, and the sums leave you with few options so it's a good place to start. Hard cages span more cells and force you to hold more combinations in your head. Start easy. The adding becomes second nature after a few puzzles.

You unlock Killer Sudoku by completing one Redacted mode puzzle. I wanted it to feel like you earned it rather than just having it sitting there from the start. Finish one Redacted game and Killer opens up. Felt like the right way to do it.

It's free, like everything else in the app. Open Coffee Sudoku, pick Killer, and go. If the regular puzzles have been feeling a bit samey lately, this woke my brain back up.