Every month, PlayStation Plus subscribers are treated to a new batch of free games to claim across PS4 and PS5. Generally the PS4 and PS5 games are kept separate, but sometimes when a game is available on both systems, subscribers are able to access both versions. This way PS5 users can play the best version of the game available, while those on PS4 aren't left out. Unfortunately, that's not the case with one of the free PlayStation Plus games for December 2021.