puzzlephil

Border Sum Sudoku

Rules

Fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9. The numbers at the border indicate the sums of the three first digit in that row or column.

Sample puzzles

EASY

MEDIUM

HARD

EVIL

[explanation of special sudoku variants]

Border Sum Sudoku – Colour Border Sum Sudoku – Diagonal Border Sum Sudoku – Extra Regions Border Sum Sudoku – Kikagaku