Solva: Sudoku & Logic

Solva is a calm collection of pure-logic puzzles, made for people who want to think — not to be nagged.

THREE PUZZLES, ONE DESIGN
• Classic Sudoku — 9×9, the one everybody knows.
• Killer Sudoku — sudoku plus cages that add up to a target.
• Crowns — place one crown in every row, column and coloured region. No two may touch.
Learn one interface and you know them all.

EVERY PUZZLE IS SOLVABLE BY LOGIC
No guessing is ever required. Every puzzle has exactly one solution and has been checked by a technique-aware solver before shipping. If a puzzle says Hard, it means Hard because of the reasoning it needs — not because we took clues away.

NO LIVES. NO HEARTS. NO "THREE MISTAKES AND YOU LOSE."
Mistakes are counted and shown on the result screen, and that is all they do. You can also turn the mistake warnings off completely and check only when you are finished.

HINTS THAT TEACH
Three levels, your choice: a nudge that points at the right region, an explanation in plain language of the next logical step, or simply the answer. The explanation names the reasoning, so the next puzzle is easier on your own.

9,000 PUZZLES, COMPLETELY OFFLINE
3,000 numbered puzzles per type, plus a fresh daily puzzle. Everything ships inside the app. No account, no connection, no waiting — on a plane, on the metro, anywhere.

BUILT TO BE READ
Big, clear numerals. A separate number-size control so the grid stays legible however you set your phone's text size. Two themes, Imperial and Classic Light, both free. Cages and regions are marked by borders as well as colour, so they read for colour-blind players too.

MADE FOR COMFORT
• Notes with automatic clean-up
• Unlimited undo and redo, never behind an ad
• Row, column, box and same-number highlighting — all switchable
• A timer you can hide
• Your puzzle is saved every few seconds and waits exactly where you left it

FAIR ABOUT MONEY
Every puzzle in the app is free forever. There are no puzzle packs to buy. Ads appear only after a finished puzzle, never during one, and never as banners stealing your keypad. One purchase removes them.

Pure logic. No guessing, no clutter — just beautifully made puzzles.