Frame Sudoku, also known as **Outside Sum Sudoku**, is a puzzle that features an empty 9×9 grid. Along the outside of the grid, you will find numbers that represent the sum of the first three numbers in the corresponding row or column in that specific direction.

In simpler terms, the numbers placed outside the grid provide you with valuable clues. These numbers indicate the total sum of the first three numbers that you will find in the rows or columns from that particular direction. By using these sums as hints, you must then fill in the remaining cells inside the grid with numbers from 1 to 9, making sure that each row, column, and 3×3 sub-grid contains all the numbers from 1 to 9 without any repetition.

The challenge in Frame Sudoku lies in deducing the correct numbers based on the given sums and ensuring that all the usual Sudoku rules are followed while solving the puzzle.