Regex Crossword

Regex Crossword is an offline puzzle game. Every line of the grid is a regular
expression; fill the cells so that each line, read in its own direction,
matches its clue exactly (a whole-string match).

Features:

* Three difficulties: Easy (rectangle 5x5), Medium and Hard (hexagon). Puzzles
are generated on your device from a seed, so the number of levels is
unlimited.
* The hexagonal board has three colour-coded reading directions (X, Y, Z); the
rectangle board uses rows and columns. Each clue shows its reading direction
and start cell.
* Tap a cell and use the on-screen keyboard. Pencil-mark notes, per-cell hints,
"givens" (letters a clue writes down literally), undo/redo, and a per-level
timer.
* Progress is saved automatically for every level.

Hard levels are pre-generated with a solver so that their answer is unique.

No accounts. No ads. No network access. No permissions.

Regex Crossword is free software under the MIT licence. The hexagonal "A
Regular Crossword" form was popularised by Dan Gulotta (based on an idea by
Palmer Mebane) in MIT Mystery Hunt 2013. This app is an independent
implementation and includes neither the original puzzle nor its text.

Source code: https://github.com/CuSO4Deposit/regex-crossword

Offline regex-crossword puzzles for Android.

* Easy (rectangle 5x5) and Medium / Hard (hexagon) difficulties.
* Puzzles generated on device from a seed; Hard levels pre-generated with the
solver so their answer is unique.
* Notes, per-cell hint, givens, undo/redo and a per-level timer.
* Progress saved automatically. No accounts, ads, network access or permissions.
* Release APK keeps R8 shrinking (smaller download) and is reproducible, so
F-Droid ships the developer's own signature.