Gridz

Gridz looks like a crossword but has no clues. The only thing you know is the shape of the grid, and the job is to find letters for every white square so that each run across and down is a word. Without clues the puzzle becomes one of deduction: which word can sit here and still let the crossing words work?

The keyboard helps you along. It highlights the letters that belong in the word you are filling, so you are choosing from a small set rather than the whole alphabet. If you get stuck you can check or reveal a letter, a word or the whole grid; correct letters turn green and wrong ones red.

There are three sizes each day. The Mini is a five by five grid, the Main is eight by eight and the Mega is a larger board. Puzzles ramp up from Monday to Sunday, so Monday is a warm-up and Sunday the hardest. A results page records your streak and your Main solving times by weekday, a global top 10 lists the fastest solves, and you can invite friends with a link to compare times. Arrows let you go back to earlier days. No account is needed, and you can add the site to your home screen to play it like an app.

It suits crossword players who enjoy the grid more than the clues, and fans of clueless word grids like Knotwords.