NumbersGrid

About NumbersGrid

NumbersGrid sets out a grid where each row and each column carries a number condition. Tap a square, type a positive number and prove it: the game checks the number against both conditions live, rather than looking it up in a list, so any number that really fits is accepted.

Every square needs a different number, and a repeat is rejected. Scoring depends on the number you choose, not just whether it fits. Valid answers are ranked, so a small number many people would think of earns 100 points as Common, while rarer picks rise through Not Bad and Lovely to Mathematician at 1000 points.

The conditions draw on number theory and digit anatomy: primality, divisor sums, figurate numbers such as triangular or square numbers, and the like, and a Current Classifications page lists them. Besides today's grid there is a practice mode of random grids, a streak counter and a shareable result when the grid is complete.

It suits players who like numbers for their own sake, and it rewards knowing that a number has a nickname as much as doing a calculation.

How to play NumbersGrid

1. Choose Play today's Grid from the menu.
2. Read the condition on each row and each column.
3. Tap a square, type a positive number that fits both its row and column, and prove it.
4. Use a different number in every square; repeats are rejected.
5. Pick rarer numbers for more points, then share your completed grid.

Tips

• Browse the Current Classifications page first so you know what each condition means.
• Avoid the first number that comes to mind if you want a high score: it is likely common.
• Fill the strictest pairings first, before the easy numbers are used up elsewhere.

Questions