Made for the moment
something clicks.
PuzzleCub is an independent browser-game collection by Neurantra LLC. We make puzzles built around simple rules, clear feedback, and the pleasure of figuring something out.
Our first browser game: Alphadoku
Classic turns Sudoku into a word-and-logic puzzle, with nine distinct letters and one hidden line. Mega offers a quieter, larger challenge using A–Y in a 25×25 grid. Both are unlimited, with no account or purchase required.
Web games and mobile apps
The browser collection lives at puzzlecub.com. Our mobile app directory lives at puzzlecub.app. The existing PuzzleCub mobile app and sibling games remain separate products; their purchases and saved progress do not transfer to this website.
How we check our puzzles
Classic uses the same constraint engine as our mobile game, checking Sudoku and the hidden-line rule together. Mega accepts clue removals only with a constructive uniqueness proof. Its initial difficulty levels describe clue density. Our English word library contains 2,671 validated isogram targets; its editorial review was AI-assisted, not independent human review of every entry.
Help us make it better
Found an awkward phrase, a confusing control, or an accessibility problem? Tell us the mode, difficulty, browser, and what happened. Please do not send payment information or passwords.