Originally Posted by
HiranaiVashai
PC, PSP slim, XBox 360.... Skype.
True, not a game, but it is one service that has been cross platform. Games and applications are basically still the same. Both code with data and references, CPU instructions and what not. Not many games have been made cross platform and even this day and age some games are isolated to a single platform per implementation, Destiny being an example. I don't know many games that implement a voice chat server, UT2004 being one of the earlier servers to provide such features. I also honestly don't know many actual cross platform games aside of FFXI and FFXIV.