First, build and run nksrv project. Next, open libsodium-1.0.18-RELEASE/libsodium.sln and build that as well. Ignore the failed tests as the encryption public key was hardcoded.

After that, add the following to your C:\Windows\System32\hosts or /etc/hosts file to use the local server:

127.0.0.1 cloud.nikke-kr.com
127.0.0.1 global-lobby.nikke-kr.com
127.0.0.1 aws-na-dr.intlgame.com
127.0.0.1 sg-vas.intlgame.com
127.0.0.1 aws-na.intlgame.com
127.0.0.1 common-web.intlgame.com
127.0.0.1 li-sg.intlgame.com
127.0.0.1 data-aws-na.intlgame.com
255.255.221.21 sentry.io

As Nikke encrypts packet data, you also need to replace C:\NIKKE\NIKKE\game\nikke_Data\Plugins\x86_64\sodium.dll from the one you built.

NOTE: Make sure to undo these modifications (especially change back sodium.dll) to play on the offical servers.

After doing the following steps, you can register an account in the launcher (enter anything into email verification code section), and play like normal.

Progress

Stage and story information is saved, as well as player nickname. Nothing else works though, such as lobby UI and rewards.

Contributing

Server code structure:

nksrv/LobbyServer: Handles save data. nksrv/IntlServer: Provides Launcher APIs and authentication nksrv/Protos: Google protobuf definition files DataFixupUtil: Utility to parse packets from server/client