The Unnamed Number Puzzle

Nine digits. Six equations. One answer. Prove your mental math prowess or break out the pencil and paper (or spreadsheet!) Solve the grid. Earn your tallies.

Simple rules. Surprisingly deep puzzle to solve. Every puzzle hides a grid of the digits 1 to 9. You get the equations: three across, three down, each with a target from 1 to 9 and no two alike. Your job is to work out which digit belongs where. Each puzzle has one solution, so a lucky guess won’t get you out of a hard one. 362,000 possibilities but only one solutions (yes, we checked them all!)

Challenge yourself in four difficulty levels: Gentle- just as it says, a friendly introduction with mostly addition and some subtraction. Mild - a bit of spice, no starting digit. Medium - some more flavor, a little multiplication and a more intriguing grid. Spicy - bringing the heat, plan some time, division, maybe some fractions along the way.

Score some tallies for solving a puzzle quickly. Score more for higher difficulty.

Getting stuck? Reveal a puzzle or skip to a new one by using a Golden X.