Is it possible to make "expansion packs" to your completed projects? I have a Game idea that can use one, Its my take on a Card game lets just say, and the Expansion Packs would be for more cards. This is for a Character-based Card Battle game with gameplay thats a bit of a mix of both the Neo Geo Pocket Color and Nintendo DS versions of SNK Vs. Capcom Card Fighters Clash. (With some different aspects as well.)
I can explain my Gameplay ideas more if anyone is interested but I would like to at least want to know if "Expansion Packs" are possible?