Detailed instructions for working a group puzzle of type 'TicTac-STU'

The 3 elements in each group of this type of puzzle are: S, T, and U.

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

Each row is a group numbered as shown in this TicTac-STU figure.

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

Each column is a group numbered as shown in this TicTac-STU figure.

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