Ophex

About Ophex

Ophex arranges seven numbers in a hexagon, one in the centre and six around it, with +, -, x and / operators placed between neighbouring numbers. You tap an operator to apply it to the two numbers it sits between, and the result takes their place; where order matters, the game asks which way round. Step by step you merge all seven numbers into one, and the puzzle is solved when that last number equals the target.

Intermediate results can be fractions or negative numbers, shown as improper fractions, mixed numbers or decimals as you prefer, but the target is always a whole number. There is usually more than one route to it. Undo, redo and restart are available, and the share text counts how many undos you used.

A new numbered puzzle appears every day (number 525 in early October 2026), the same for everyone, with a countdown to the next, streak tracking and access to earlier puzzles. Ophex is by Andrew Taylor, whose other puzzles include 3Doku, Cell Tower, Celtix and Ronin.

It suits players who like Countdown-style arithmetic but want a spatial twist, since which numbers are neighbours matters as much as the sums.

How to play Ophex

1. Open Ophex and note the target for today's puzzle.
2. Tap an operator between two neighbouring numbers to combine them.
3. Choose the order when asked, for subtraction and division.
4. Keep combining until only one number is left.
5. Make that number equal the target, then share your result.

Tips

• Plan the last step first: which two numbers could make the target?
• Division can leave fractions that cancel out later, so do not fear them.
• Combine the centre number early or late depending on which operators surround it.
• Use undo freely, but fewer undos look better in your shared result.

Questions