About Us

Sudoku either clicks for you or it doesn't, and once it clicks, the difficulty curve matters more than almost anything else - Vucui's selection was picked specifically for having an honest spread from easy grids to genuinely mean ones.

Alongside standard 9x9 puzzles there's killer sudoku with its added sum constraints, a few irregular-region variants, and quick mini-grids for when a full board feels like too much commitment. Notes and candidate-marking tools are built in rather than bolted on.

Those note tools go a bit deeper than the usual small-number scratchpad - proper candidate highlighting and easy undo, since fumbling the interface shouldn't be the hard part of a logic puzzle.

It all runs as HTML5 in the browser, so a grid started on a laptop can be picked back up on a phone without any sync headaches.

Vucui is ad-supported, which is the only reason none of this sits behind a paywall and difficulty settings stay visible up front instead of being buried in a menu..