Aquarium· Advanced

Goal

Fill each aquarium with water so that every row and column hint is satisfied.

Rules

  • Each row/column number is the total count of water cells in that line.
  • ↓Within a single aquarium water rises from the bottom. If any cell holds water, every cell in the same aquarium at the same row or below must also hold water.
  • ★Win when all hints are satisfied and the gravity rule holds for every aquarium.

How to Play

Coral marks water, ✕ marks a cell you are sure is empty. Thick borders separate aquariums.

Tip

  • A 0-hint row or column is entirely empty.
  • A hint equal to the line length means that whole row or column is water.
  • Reason from the bottom cells of each aquarium upward to pin down the water level.

Baddeley and Hitch (1974) proposed visuospatial working memory as the key resource for spatial-relation reasoning. Cornoldi and Vecchi (2003) documented the value of multi-constraint visuospatial puzzles for working-memory training, and Shah and Miyake (1996) showed that spatial processing resources are separable from verbal resources, making training effects domain-specific.