Killer Sudoku Extra Regions is basically just that - a regular Killer Sudoku puzzle but with the addition of a varying number of additional regions.
The aim is simple: place the digits 1 to 9 into the puzzle grid so that each digit occurs once in every row, column, bold-lined 3 by 3 box and and each of the marked extra regions, whilst ensuring that each of the dashed-line cages adds up to the given total (and doesn't repeat a digit within a cage).
There is always one single solution, which can be reached via sensible logical deduction. Guessing is never needed!
We can supply Extra Regions Killer Sudoku puzzles at a range of sizes and difficulties. All of our puzzles are either entirely hand-made or have significant manual input into the process.