Logic Masters Deutschland e.V.

Classic Aquarium rules:

1. Each region delimited by thick lines is considered a single aquarium.
2. Each aquarium might contain some shaded cells representing water.
3. Water cells in each aquarium must belong to rows below all air cells (unshaded) in the same aquarium.
4. When filling a cell with water, all the cells in the same aquarium and in the same row must also be filled with water.
5. The clues at the sides of the 6x6 square tell you how many water cells are in that row/column.

Additional rules:

1. Each Aquarium that is atleast 6 cells in size must contain a fish.
2. Each fish will pick its own position in their aquarium following these rules:
   1. Fish must be in a water cell.
   2. No row or column can contain more than 1 fish.
   3. No fish can be diagonally adjacent to another fish.
   4. When possible, a fish will pick a cell that is directly below an air cell in their aquarium. (For optimal feeding)
      Otherwise, fish will pick the lowest available cell where they can touch the bottom of the aquarium. (For getting the food that sunk to the bottom)