Given that there are 117 Digimon to befriend in Digimon Survive, it's perhaps understandable why the developers opted to limit the number of collectibles in the game. There are just 15 of them in total, though finding all of the Perceived Memories in Digimon Survive will likely prove to be incredibly frustrating for some players. Not only are they very easy to miss, but finding them all will require three separate playthroughs, which will likely equate to well over 100 hours of playtime.