Range (BrainBashers)

Range is BrainBashers' name for the Japanese puzzle Kuromasu. The grid starts with numbered squares, which are always white. Each number says how many white squares can be seen from it, looking up, down, left and right in straight lines and counting the numbered square itself. Your job is to blacken squares so every count comes out right. Black squares block the view, may not touch one another horizontally or vertically (diagonals are allowed), and must not cut the white squares into separate groups.

Kevin Stone's site posts eight sizes a day: 4x3, 5x4, 6x5 and 7x6 at Easy, 8x7 and 10x8 at Medium, and 12x9 and 15x10 at Hard, plus a 20x15 weekly special. The play page greys out squares automatically as you go (you can switch that off), and has check, answer, print and restart buttons, an option to show mistakes and an optional clock. The help page has a walkthrough.

Puzzles change at midnight GMT or at the time zone you set, and the date list keeps the last four weeks, with Random easy, medium and hard buttons for extra grids. No adverts, no account.

It suits players who like Hitori and other shading puzzles, and the small sizes are quick enough for a coffee break.