: A compressed folder format; you would need a program like WinRAR or 7-Zip to open it and extract the .cia file.
: The "Gold Edition" specifically bundles the base game with all 10 downloadable content (DLC) Coin Rush packs (30 additional courses) pre-installed. File Metadata Decoded
: The file format inside the archive is a .cia file, which is used for installing software on custom firmware (CFW) Nintendo 3DS systems.
: This is the base game featuring the "Coin Rush" gameplay mechanic.