About This Demo

The whole app. A fixed shelf of puzzles.

This demo runs the same code as the paid game. Same interface, same themes,
same accessibility work, same complete absence of ads, accounts, and network
requests. The only difference is where the puzzles come from: a bundled library
rather than an endless generator. Play it as long as you like. There is no
trial timer and no countdown.

What you get

• 28 handpicked puzzles spanning every grid size in the game.
  
• 20 of them are 9×9, five each at Easy, Medium, Hard, and Maximum, so
  you can find your level before you buy.
  
• 4×4, 6×6, 16×16, and 25×25 each come with an Easy and a Medium board.
  Yes, the 25×25 is really in the demo. It takes a while.
  
• A new daily 9×9, every day, forever. The daily puzzle is not gated.
  Install the demo and you have a fresh Sudoku each morning for as long as you
  keep it.

Everything else is already here

• Pencil marks, undo and redo, and hints when you want them.
  
• Statistics, solve history, and favorites, all stored on your device.
  
• Mouse, keyboard, or touch. Each one on its own is enough to play the entire
  game.
  
• High-contrast theme, colorblind-friendly design where color is never the
  only signal, system text size support, and a full screen-reader label tree.
  
• Zero network requests. No analytics, no advertising, no crash reporting.
  That holds for the demo too.

What the full version adds

• Unlimited puzzles at every size and difficulty, generated on demand
  rather than picked from a shelf.
  
• Hard and Maximum difficulty on 4×4, 6×6, 16×16, and 25×25 as well as
  on 9×9.
  
• Seed entry and sharing. Every board is generated deterministically
  from a seed and has exactly one solution, so a seed you send someone is
  genuinely the same puzzle when they open it.

One purchase, no subscription, no in-app anything.

Before you install

The demo keeps its own save data, so it can sit alongside the full game without
either one touching the other's puzzles, statistics, or settings. That also
means demo progress stays in the demo. Buying the full version starts you with
a clean slate and an infinite supply of boards.