Float & Sink
Put one balloon and one iron ball in every room. Balloons must touch the ceiling, balls must rest on the floor. Anything with nothing to hold it wobbles and shows where it would drift. 30 puzzles.
Play nowHow to play
Controls
Tap- Thick lines split the grid into rooms; dark stones are solid.
- Tap a cell for a balloon, again for an iron ball, again for a dot (empty), again to clear.
- Each room needs exactly one balloon and one ball.
- A balloon needs the top edge, a stone or another balloon right above it; a ball needs the bottom edge, a stone or another ball right below it.
About the game
Float & Sink is a gravity logic puzzle based on Dosun-Fuwari. The board is divided into rooms by thick lines, with a few solid stones scattered around. Every room must hold exactly one red balloon and one iron ball. Balloons float, so each balloon needs something directly above it: the top of the board, a stone, or another balloon stacked under it. Balls sink, so each ball needs the bottom of the board, a stone, or another ball directly beneath it. Rooms that sit on top of each other start to depend on one another, and that is where the real deductions live.
The twist is a gravity preview. Place a balloon where nothing holds it and it wobbles while a faint copy drifts upward with a red arrow; a loose ball does the same downward. The rule becomes something you watch rather than something you remember. Thirty puzzles grow from tiny 4x4 boards to 8x8 buildings full of stacked rooms, each with exactly one answer. Dots mark cells you know are empty, and hints fix a mistake or place one piece.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.
