Lunoku

About Lunoku

Lunoku is a Takuzu puzzle, the same family as Binairo and LinkedIn's Tango. Every cell takes either a sun or a moon, and three rules decide which: no more than two of the same symbol side by side in any row or column, an equal number of suns and moons in every line, and no two rows or two columns alike. Each puzzle has one solution that can be reached by reasoning, so guessing is never needed.

The daily puzzle is built from the date and is the same for every player. It follows a weekly curve: a 6x6 grid from Monday to Thursday, 8x8 on Friday and Saturday, and a larger 10x10 on Sunday. A quiet timer runs while you play, and when you finish the app shows your time against your own average. A calendar marks each solved day, and missed days can be unlocked from the archive.

What sets Lunoku apart is its hints. A hint fills one cell you could have worked out and names the rule in a short sentence, such as a line that already holds all its suns. The idea is to teach the techniques so the hints are needed less over time. You can also long-press a cell to lock it once you are sure of it.

Beyond the daily there is an unlimited practice mode with 6x6, 8x8 and 10x10 grids, and a stats page with streaks, average times per size and a chart of the last 14 days. Lunoku is made by Ferran Espuna and came out in July 2026. It works offline apart from its ads, needs no account and keeps your progress on the device.

How to play Lunoku

1. Open Today in Lunoku and start the day's puzzle.
2. Tap a cell to cycle it through empty, sun and moon.
3. Make sure no row or column has three suns or three moons in a row.
4. Balance every row and column so it holds as many suns as moons, and keep every row and column different from the others.
5. Long-press cells you are sure of to lock them, and finish the grid to log your time and streak.

Screenshots

Tips

• Two matching symbols side by side force the opposite symbol at both ends.
• A gap between two matching symbols must take the other symbol.
• Once a line has half its cells as suns, the rest of that line are moons.
• Near the end, compare almost-finished rows: two rows may not end up identical, which often settles the last cells.

Questions