Lucerna: Akari Light Up

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Lucerna is an Akari puzzle — also published as Light Up — for players who like unhurried, honest logic.

You place lamps in the open cells. A lamp lights its own cell and everything in the four directions until a wall stops it. No lamp may light another lamp, every open cell has to end up lit, and a numbered wall has exactly that many lamps beside it. Two rules pulling against each other, and the numbers saying where the balance is.

Never a guess

Every puzzle has exactly one solution, and every step of it can be reasoned out. Each board is verified by a solver that only uses techniques a person can follow and explain — so a puzzle that would need trial and error never ships. The hint button uses that same solver, which means a hint is always a move you could have found yourself, and it tells you which idea it used.

Learn it by playing it

The rules fit in four lines and the seeing takes longer. The walkthrough hands you real positions and asks for the one cell that follows, then shows you why. No board in it was made up — each is a genuine puzzle stopped at the moment the idea it teaches becomes the forced next move.

Three ways to play, all offline

• 12 campaign chapters, from gentle openings to genuine work
• A daily puzzle, the same one for every player worldwide, with a gentle Monday and a demanding Sunday
• Endless mode in four difficulties: Easy, Medium, Hard, Expert

Measured in months, not streaks

Fill in every day of a calendar month and the month earns its own trophy. There is no streak to lose: a day you missed can still be filled in from the archive, so a week away from the game costs you nothing.

Built to be pleasant

• Warm Material 3 design, light and dark, following your system colours
• Completely offline — no account, no sign-in, no network needed
• One tap places a lamp — no dragging, no typing
• No countdowns you did not ask for and no interruptions

27 languages supported. No account required. Pure logic.