One Star

A square grid cut into regions, with one star to find in every row, every column and every outlined region — and no two stars touching, not even at a corner. Nothing is given; the board starts empty, and the shapes of the regions are the whole puzzle. Where a star cannot go counts for as much here as where one can, so the crosses you leave behind are your own notes and only the stars are the answer. The same rules are published elsewhere under the name Queens.

Here a tap crosses a cell out, a second tap puts a star on it and a third clears it; drag across cells to cross out several at once. Each region stands on a quiet tint of its own so its shape reads at a glance, and the board tells you only what your own stars already say: a star turns red when it touches another, or when its row, column or region holds too many. No hints, and nothing that checks you against the answer. Of the two, this is the gentler one: the same puzzle with two stars a line is Star Battle.

A new board every day — 6 × 6 ★, 8 × 8 ★, and 10 × 10 ★ — the same for everybody, each with a single solution that reasoning alone reaches. No timer and no account needed: a board left half-done waits for you until the day turns, at midnight UTC.