To understand the obsession, you need to understand the format. A .cia file is not a virus, nor a standard game rom. It stands for —a file format used by hacked 3DS consoles to install games directly to the system’s home menu, just like an official eShop download.

Call of Duty: Black Ops II is a first-person shooter game developed by Treyarch and published by Activision. Released in 2012, the game is the ninth installment in the Call of Duty series and a sequel to Black Ops. While the game was initially released for PlayStation 3, Xbox 360, and Microsoft Windows, many gamers have been searching for a way to download Call of Duty Black Ops 2 for the Nintendo 3DS.

or a "fake" file that could damage your console or compromise your security. Unreleased Projects

games released for the original Nintendo DS (which are playable on the 3DS via backward compatibility), Activision confirmed shortly before the 2012 launch that Black Ops II

Disclaimer: This article is for educational and critical discussion purposes only. Piracy harms developers. Modifying your console voids your warranty and carries risks. Always download CIAs only from trusted sources like hShop (for games that actually exist).