Visual primer for first-time solvers
Aquarium,
shown not told.
Live demonstrationStep 01 / 07
Step01—Meet the board
This is Aquarium.
A 5×5 grid divided into 5 irregularly shaped blocks — the aquariums (A–E). Numbers along the right edge tell you how many water-filled cells each row must contain. Numbers along the bottom tell you the same for each column. Your job: fill each aquarium with water to the right level.
Rules in play
- Water fills from the bottom — uniformly across the aquarium's full width
- Edge numbers show exactly how many filled cells each row and column must contain
- Filling any cell forces every cell below it in the same aquarium to fill too
Water vs. air
Blue = water-filled cell (counts toward clues). X = confirmed air. Undecided cells stay cream until solved.
Water level
Water fills from the bottom up, no gaps. The ripple line marks the surface. Everything below the surface fills automatically.
Row / column clue
Dark number = target not yet reached. Green = count exactly met — the row or column is solved.