C2Doom is a game engine: You need WAD files to play it. There is a full C2Doom version that bundles a shareware version of Doom. The WAD is also available at Id Software FTP site: Doom1.wad. The C2Doom is also tested with some other WADs, please refer old instructions page. There are also a huge amount of unofficial WADs available in C2Doomers forum as well as information how to create WADs by yourself.
C2Doom full version
Even C2Doom full version is now free, I would be grateful if you would donate, a big thanks to all who has been donated this far!
C2Doom full version with shareware episode for S60 devices, File:c2doom_complete(3.02).sisx (24/09/10)
C2Doom full version with shareware episode for Symbian (Symbian^3) as well as S60 5th ed and 3rd fp1, fp2 releases devices - (BETA), File:c2doom_complete(4.1).sisx (19/02/11)