Bisecto

Bisecto is a precision game about area. Each shape is a polygon generated by the game, from plain convex outlines to jagged ones with narrow lobes and holes, and it needs one straight cut that splits it into two equal halves. When you make the cut the shape comes apart, each piece is labelled with its share, such as 44.1 and 55.9 percent, and the game turns the smaller side into an accuracy score, with a short timer on each shape.

The daily is the centre of it. Every day there is a numbered Daily Challenge of ten identical shapes for everyone, drawn from the date at the harder difficulty levels, and you get one attempt. Your average accuracy can go onto the daily leaderboard if you log in, a streak counts the days you play, and the share card shows a row of coloured squares for your cuts. The next challenge arrives at midnight UTC.

You can choose how to cut: draw the line by dragging, slide a line across, or rotate one around the centre. Outside the daily there is an arcade run where every cut must reach 95 percent and three misses end it, a practice mode with six difficulty levels, and friend challenges where everyone gets the same shapes and the best score wins. The maker's own article on the site explains the maths behind the scoring, from the shoelace formula to why a perfect cut always exists.

It suits players who like quick spatial puzzles, and anyone who suspects they can eyeball the middle of a shape better than they can. It plays in the browser on a phone or a computer, with no ads.