Enigma Codes

To solve Code n, you will need to do the following:

First row: Put n in the first column. To get the value of the next column, add n to the current column's value. If the value exceeds 9, use the digital root.

Second row: To get the current column's value, subtract the value of the first row's same column from 9.

0 is never part of the code. Each column adds up to either 9 or 18.

I did look at hints online and basically the principles are easy to understand. Just make sure you get all the codes before you try. Think about patterns that are possible in sequences of numbers. To know the sequence patterns you have to look for rather blunt clues in the environment of the game stages themselves.