RegHex
Fill a hexagonal grid so every row matches its regex clue
RegHex is a regex crossword on a grid of hexagons. Every row has a regular expression as its clue, and you must fill each cell with a letter so that all rows match. You click a cell and type a letter from A to Z. When a row is full, it turns green if it matches its clue and red if it does not. You rotate the board to work on the rows in each direction.
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About RegHex
The puzzle is A Regular Crossword by Dan Gulotta, from an MIT puzzle hunt, and it is hard. It suits people who already read regex well and enjoy long logic puzzles.
The page was made by Noah (rampion) as an easier way to solve the puzzle on a computer. It is free and runs in the browser.
On Breakpoint since 23 Oct 2026.