Halloween Sudoku

Halloween Sudoku sits on the Puzzle shelf of this catalogue, and opening it is the whole setup process. Taps and swipes are the whole vocabulary — a phone plays it best. Catalogued as halloween, html5, mobile, sudoku.

It is drawn for a tall screen, so it fills a phone held upright rather than a wide monitor. Free to play in the browser, with no install step between you and the first round.