To solve a ShapeShifter Addoku puzzle, use only the numbers from 1 to 9. The numbers in squares linked by a white line must add up to the total given in the top left-hand corner of the set of linked squares. No number is repeated in any of these sets of linked squares.
Every number from 1 to 9 must also appear in:
- Each of the nine vertical columns
- Each of the nine horizontal rows
- Each of the nine blocks of same-coloured squares
The totals given in a ShapeShifter Addoku are like clues. Each is a total to a sum. You have to work out which numbers add up to the total to fill the linked squares. Sounds easy, but each answer has to fit in with the other sums around it.
Use Addoku techniques to help you solve the puzzle. For example, a total of 4 in two squares is a unique Addoku Block. It can’t be 2 + 2 because each set of linked squares can contain only one of each number. So the two squares can have only 1 or 3, though you don’t know in what order the 1 and 3 go until you look at the other sums around them.
Use the mouse to click up (or down) through the numbers 1 to 9 in each square.
The small black arrows on each side of the square tell you whether you are counting from 1 up to 9 (right arrow) or from 9 down to 1 (left arrow).
Using your keyboard, you can type in up to eight practice numbers above the line at the top of each box.
Cross-hatching shows you have correctly completed a set of squares linked by a white line or a group of nine same-coloured squares. Any practice numbers disappear.
PRINT: Click to print the ShapeShifter Addoku
- Available to YouPlay Premium Members only
- Selected puzzles only
SAVE: Click to save the Shapeshifter Addoku
- YouPlay Premium Members receive 10 puzzle save slots
- YouPlay Members receive 3 puzzle save slots
PAUSE: Click to halt the timer if you wish to pause during game play
EXIT: Click to return to the Game Selection page
UNDO: Undo your moves one click at a time
CLEAR GRID: Undo all moves and start the ShapeShifter Addoku again
TOKEN COUNTER: Displays how many tokens you have won during the game
TIMER: The timer starts as soon as you open the ShapeShifter Addoku
YouPlay BOOST: Boost your score - multiply your points by working faster and smarter
HINTS: Click to add an extra number to help you solve the ShapeShifter Addoku
- YouPlay Premium Members receive 5 hints
- YouPlay Members receive 5 hints