Daily Binairo

Binairo, also known as Takuzu, starts with a few black and white circles already in the grid. You fill the rest under three rules: every row and every column holds the same number of black and white circles, no more than two circles of the same colour may be adjacent in a line, and no two rows (or two columns) can be identical. The third rule rarely matters early on but often settles the last few cells.

Puzzle-binairo.com has Easy and Hard grids from 6x6 to 20x20, and a Binairo+ variant with its own sizes and specials. The Special Daily Binairo is one dated grid for everyone, bigger than the regular sizes; the 20 October 2026 puzzle was 24 by 24. A Special Weekly and a Special Monthly grid run beside it. Clicking a cell places a black circle and clicking again makes it white. The site shows ads around the board; patrons, from $1 a month, lose the ads and can reopen the last 30 daily puzzles. The site also comes in 17 other languages, from French and German to Japanese and Chinese, with the same daily grid.

If you play LinkedIn's Tango, this is the same family of rules on a far bigger board with no extra symbols to help. It suits players who like fast, mechanical deductions that pile up into a long solve.