Rules.

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 Information and press Rules .




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