Battleships (BrainBashers)

This is the pencil-and-paper puzzle sometimes called Bimaru, not the two-player guessing game. Above the grid the site shows the fleet you must find, from single-square boats up to long battleships. The numbers beside each row and column give how many ship segments it contains, and some squares are revealed at the start: a piece of water, a ship's end, a middle section or a whole small boat. Ships lie horizontally or vertically, and no two ships may touch, not even diagonally.

Kevin Stone's BrainBashers posts five puzzles, labelled A to E, at each of five sizes every day: 6x6, 7x7, 8x8, 10x10 and 12x12, with a 15x15 weekly special. The play page has check, answer, auto, print and restart buttons, options to show the remaining count in each line and to highlight finished clues, and an optional clock. The help page walks through a solve.

The puzzles change at midnight GMT or at your chosen time zone, and the date list keeps the last four weeks. Random easy, medium and hard buttons deal extra puzzles beyond the dated ones. No adverts, no account.

The 6x6 and 8x8 grids fit a phone screen; the 10x10 and 12x12 grids run past the right edge at phone width, so they are easier on a desktop or tablet.

With twenty-five puzzles a day it suits players who want plenty to get through, from a quick 6x6 to a careful 12x12.