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Detailed instructions for working a group puzzle of type 'Cathrine'

This is a signature puzzle named 'Cathrine'

The 8 elements in each group of this type of puzzle are: C, A, T, H, R, I, N, and E.

Every group in the puzzle must contain exactly this set of elements.

Each row is a group numbered as shown in this Cathrine figure.

In a Cathrine puzzle, each row is a group numbered as shown in the figure above.

Each column is a group numbered as shown in this Cathrine figure.

In a Cathrine puzzle, each column is a group numbered as shown in the figure above.

Each 4x2 rectangle is a group numbered as shown in this Cathrine figure.

In a Cathrine puzzle, each 4x2 rectangle is a group numbered as shown in the figure above.