This is the first of a series of three puzzles which get progressively more difficult. Finish the first for a link to the second, and finish the second for a link to the third. Or wait, and I’ll post them here.
Rules:
Normal Sudoku rules apply.
Killer Sudoku: The digits in each cage sum to the small number in the top left corner of that cage.
Estimated difficulty: 1 out of 5
Solve on SudokuPad