You should erase digits. They can be erased only in couples:
- two equal digits
- two that gives 10 together
You can erase two digits that:
- are nearby in horisontal line. As well
- nearby through the split line
- in the next line
- are nearby in vertical column. And the next column as well.
- splited by earlier erased digits
Look at the picture.
There is more information in built-in help. To find it go to
and press Rules .
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