A bit of logic. A lot of de-duck-tion

DuckOff

Puzzle board

Pond mode

1 duck 2 ducks

Pond size

8 10 12

Difficulty

Easy Medium Hard

Changes start a fresh pond

Still hiding

— ducks left

Across the whole pond

Tap to cycle: empty → × → duck → empty

This pond

Need a nudge?

Reveal every duck and end this round?

Display

Find every hidden duck. Easy ponds use pure deduction; Medium and Hard may ask you to test a careful assumption.

One duck in every row. Once you find it, the rest of that row is empty.
One duck in every column. The same rule applies from top to bottom.
One duck in every colored region. Regions can bend; follow their color and thick outline.
Ducks never touch. They cannot be next to each other, even diagonally at a corner.
Mark as you deduce. Tap a square to cycle between empty, ×, and duck.

Start where a row, column, or region has the fewest open squares.
Tap once for ×, again for a duck, and once more to clear the square.
Cross out ruled-out squares yourself as you narrow the pond.
Easy needs no assumptions. Medium may need one; Hard may need two, with a deduction between them.

🦆

POND COMPLETE!

Flawless de-duck-tion

The whole pond is in perfect order.