Norinori Logic Puzzle: Duplex

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Duplex is a Norinori puzzle for players who like unhurried, honest logic. The name means "twofold", and the rule is exactly that: every region holds two.

The grid is cut into regions. Shade cells so that every region ends up with exactly two shaded cells, and so that the shaded cells come as dominoes: every shaded cell touches exactly one other shaded cell, side by side. A domino may cross a region border, but two dominoes never share an edge. Tap a cell to shade it; press and hold to mark it unshaded.

One solution, every time

Every puzzle has exactly one solution, checked by a solver before it ships. The hint button uses that same solver: it shows the next step the board allows, and says which idea it used.

Learn it by playing it

The walkthrough hands you real positions and asks for the one cell that follows, then shows you why. Five ideas carry you a long way: a region that has only two cells, a region that already has its pair, a domino that is complete, a shaded cell with only one possible partner, and a cell that can never find one.

Three ways to play, all offline

• Campaign chapters, from gentle openings to genuine work
• A daily puzzle, the same one for every player worldwide
• Endless mode in four difficulties: Easy, Medium, Hard, Expert

Measured in months, not streaks

Solve 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.

Built to be pleasant

• Material 3 design, light and dark, following your system colours
• No account and no sign-in; your progress stays on your device
• Boards shaped for a phone held in one hand
• 27 languages