: Once extracted, you will likely find an .iso file. Mount this virtual disc or extract it.
: After installation, open the "CODEX" folder inside the mounted ISO/extracted files. Copy all files from that folder and paste them into the main game installation directory, replacing the existing files. Game Guides & Walkthroughs
: Open the mounted drive and run setup.exe to install the game.
: Covers the early stages, including the first bridge and dam puzzles.
: Details the service tunnels and power station.