Add 7

Place the dice on the board by clicking on the spot you want it.
Dice of the same color of its neighbour will add its pips count to it. Different colored ones, the neighbour gets its pips subtract.
If the value is bigger than 7, subtract 7 from it, if it is smaller than 1, add 7 - Simple math!
Follow this rule to add 7 pips on a die and score really BIG.