We are blessed to have a number of various preservation projects dedicated to unreleased/prototype games, especially with the vast number of platforms out there to try and preserve for. The Hidden Palace have for many years been preserving various prototypes and unreleased games across 16-bit (and onwards) platforms and this weekend they have announced one of their biggest endeavours yet.
Over 700 PlayStation 2 prototypes have been archived for you to check out, and there is much more to come too. Keep checking out for news and updates over at https://hiddenpalace.org/News/Project_Deluge:_PlayStation_2