Lattice is a Sudoku built for people who actually want to think.

A new puzzle every day, no ads, and the kind of quiet, considered design that makes a 20-minute solve feel like time well spent.

WHAT'S INSIDE

Daily Sudoku
A fresh puzzle every day. Solve it on the train, before bed, with your coffee. Your streak lives at the top of the home screen, and the week-letter strip shows where you are.

Practice anything
Five difficulty tiers, from quick coffee-break grids to puzzles that will keep you company for an hour. Notes, hints, undo, and handwriting input are all where you expect them.

Friends and duels (new)
Add friends by @handle. Invite them to a head-to-head duel on a shared puzzle — highest score wins. Quick Match pairs you against someone in the world if you'd rather not wait for a friend. The new Notifications Center keeps friend requests, duel invites, and tournament updates in one place.

Tournaments
Compete in the Weekly Cup and other timed tournaments. Past tournaments stay in your archive so you can look back at how you placed.

Tutor library (Premium+)
Interactive, step-through lessons on the techniques that separate a fast solver from a stuck one — X-Wing, Swordfish, Jellyfish, XYZ-Wing, W-Wing, Simple Coloring, and more. Each lesson has an example board you play through, not a diagram you stare at.

Three languages
Lattice now speaks English, German, and French end-to-end — interface, lessons, push notifications, the lot.

Made for the way you actually play
Light, dark, and sepia themes. Tablet supported. Swipe from the edge to go back. Sync-backed progress so you never lose a streak.

THREE WAYS TO PLAY

— Free: daily puzzle, practice across all difficulties, three friend duel invites per day, achievements, statistics.
— Premium: unlimited friend duel invites, lives, full tournament access.
— Premium+: everything in Premium plus the Tutor library, with example boards for every technique.

One-time Lifetime purchase available if you'd rather not subscribe.