Duet (Mind Loft)

About Duet (Mind Loft)

Duet is a balanced binary puzzle. Every square takes a dot or a ring, and every row, every column and every walled room must hold exactly half of each. No line may have three of the same symbol in a row. Between some pairs of squares sit small marks: an = means the two squares match and an x means they differ.

The walled rooms are what set Duet apart from a plain binairo: they add a third kind of region that has to balance, alongside rows and columns. Each board has a single solution that logic can always reach, without guessing. Tap a square to cycle it through dot, ring and empty; a square that breaks a rule turns red, but a square that is simply wrong is never flagged, so a clean solve takes care. A clean solve scores 10 and the leaderboard is decided on time.

Board size grows through the week: 6x6 early on, 8x8 from Thursday and a 10x10 Sunday Edition. Undo, Clear and a hint are available. A new grid arrives every day at midnight Eastern.

How to play Duet (Mind Loft)

1. Open Duet and press Start.
2. Tap a square to place a dot, tap again for a ring, and again to clear it.
3. Make every row, column and walled room half dots and half rings, with never three alike in a line.
4. Respect the = (match) and x (differ) marks between squares.

Screenshots

Tips

• Two alike in a row force the opposite symbol on both ends.
• Use the x marks along a room's edge: each one fixes a pair as one dot and one ring.
• Count each room: once it has its half of one symbol, the rest are the other.

Questions