About Gridaday

Gridaday is a daily set of six logic puzzles: Star Battle, Takuzu, nonograms, Kakuro, Killer Sudoku and Skyscrapers. Every puzzle has exactly one solution, every level is set by the techniques the puzzle needs, and there is no account: your streak lives in your browser.

What is here

Today's set of six genres, at four levels each (Star Battle five); an unlimited mode with sizes and levels to choose; an archive of past dailies; rules with small puzzles to try and a worked example; a techniques page per genre with diagrams from real puzzles; printable PDFs with answers; and calculators for killer sudoku and Kakuro combinations. The bank holds 16,000 puzzles.

How the puzzles are made

Our own programs generate every puzzle, a separate program checks that it has one solution, and a step-by-step solver grades it. How we make puzzles explains each step and shows the numbers.

Independent

Gridaday is independent: our puzzles are made by our own software and are not affiliated with any puzzle app, game, newspaper or publisher. Genre names describe the rules. Some genres are popular under other names; we use those names only to describe the rules.

Who runs it

Gridaday is published by BiLingoPlus LLC. There is no advertising on the site at present. We count page views with Google Analytics 4; the privacy page says what it records. Write to hello@gridaday.com with a problem in a puzzle, a correction or an idea.