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CalcuDoku Help

Rules / Objectives Summary

  • Every square contains a single digit.
  • Complete the grid such that every row and column contains the digits 1 to the size of the grid.
  • Each row and column contains each digit only once.
  • Every square belongs to a cage, and every cage has a little number in its corner along with a mathematical symbol. The number is the answer when the digits in the cage undergo this mathematical operation.
  • The cage clue doesn't tell you which way around the digits occur, just the answer to the calculation.
  • For example 2÷ means that the digits in the cage make 2 when they are divided one way or another.
  • A digit may appear more than once in a cage (which is different to Killer Sudoku).

See the Walkthrough for extra tips and tricks.

CalcuDoku Puzzle


What are the little numbers and mathematical symbols for?
These tell you the answer when the digits in the cage undergo that mathematical operation.

Move your mouse over the puzzle to see the answer.



Walkthrough

Help 1


Step 1
This is the start of the puzzle. This puzzle has a number of different solution methods, see if you can find another way of solving it.

Solve this puzzle for yourself at the same time.

Help 2


Step 2
The only way to make 12 in two squares using multiplication is 3 x 4.

Help 3


Step 3
The only way to make 4 in two squares using multiplication is 1 x 4 (as we can't have two 2's in the row).

Help 4


Step 4
The only way to make 7 in three squares using addition is 1 + 2 + 4.

Help 5


Step 5
As we know where the <1>, <2> and <4> of Row 1 are, we know that this square is <3>.

Help 6


Step 6
As this cage must equal 2 under subtraction, it must be 3 - 1, which makes this square <1>.

Help 7


Step 7
Neither of these squares can contain <4>. This is because the 12x clue in this column MUST contain the <4>.

Can you see an alternative solution method that involves the 9+ cage and the missing numbers from Column 4 (that add to 6)?

Help 8


Step 8
Removing <4> on the previous step forced the <1> of this cage, which makes this square the <4>.

Help 9


Step 9
As we now know where the <1> for this column is, we can remove it from this square leaving the <2>.

Help 10


Step 10
As we now know where the <2> from Row 1 and the <4> for Column 1 are we can remove both of these from this square leaving <1>.

Help 11


Step 11
Row 1 is only missing its <4>, and that must go in this square.

Help 12


Step 12
This square can only be <2> as the other numbers are either in Row 4 or Column 4.

Help 13


Step 13
Both of these numbers are forced as each only has one number left in the Row or Column.

Help 14


Step 14
As we know where the <4> for Row 3 is, we can remove it from this leaving the <3>, which forces the remaining square in Column 2 to be <4>.

Help 15


Step 15
This square can only be <2> as all other numbers already occur in the row or column.

Help 16


Step 16
These squares are now forced as each only has one number left in the row or column.

Help 17


Step 17
There is only one number that this square can be, and the puzzle completes.

Help 18


Step 18
The completed puzzle.


 

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