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Down to One

Down to One Math Puzzle Game

A math puzzle game about factors: pick a number in each row, divide when you can, and try to land on exactly 1.

Puzzle & Relax# LogicFreeNo download

How to play

Down to One is a short math puzzle game about factors. You start each level holding a number, and in front of you are four rows of four numbers between 1 and 16. Going down row by row, you pick one number from each row.

If the number you pick divides your current number evenly, you divide by it. If it does not, it gets added instead. After the fourth row you see where you ended up. Hitting exactly 1 is an ACE. Anything under 10 earns a LOW, and higher than that is just High, which is your cue to try again.

The starting number is the same as the level number, so level 1 begins at 1 and the numbers climb from there. There are 256 levels. Each level always has the same grid, so you can replay it until you find the route to 1. Your current level and your best result on each level are saved in this browser, and the level list shows how you did on each one.

Credits

Down to One is a modified version of the open-source factors-game by Michael P. Nitowski, released under the MIT License. We added Chinese text, made it fit phone screens and gave it its own storage. The original copyright and license notice is included with the game files.

Controls

Desktop

Click a number in the current row to use it. Open the level list with [Select] to jump between levels.

Mobile

Tap a number in the current row to use it. Swipe up to restart the level, and tap [Select] to open the level list.

Tips

  1. 1Work backwards. To end on 1 after the last row, your number before it must equal one of the numbers in that row.
  2. 2Adding is not always bad. A small addition early on can turn your number into something with lots of factors, like 12 or 16.
  3. 31 always divides, but it never changes anything. Treat it as a way to skip a row.
  4. 4If a level is not working out, restart it right away instead of finishing a run you know will be High.

FAQ

ACE means you finished on exactly 1. LOW means you ended below 10. High means 10 or more.

256. The starting number goes up with the level.

Each level has a fixed grid, so retrying a level gives you the same numbers.

Yes, in your browser. Clearing site data or using a private window resets it.

Knowing small times tables helps, but most of the game is planning a route through four choices.

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