Tstos 18 story is not that focused around the code as last year. However the code system is still in use, and it might contain some hints and other information vital for the faction.
We have generated series of user accounts and codes for the website. By revealing the codes you are able to advance in the story. Some codes reveal coordinates pointing to a location, some reveal other vital information and puzzles.
There is a limited amount of user accounts generated. Every user account has a limit of how many searches it can make. When the limit reaches 0 the account is useless. You can fill the limit by acquiring a specific code.
Pass it to the commander or if you are a civilian keep it to your self for later use. The codes are valuable currency among the fighting factions.