Two unused games, Rampage and Skate Boardin', are in the game's files. They still have their cartridge artwork and TV screens, and can be played by renaming some files on the disk.
Contributed by DeerBoarDude
There were originally plans for the game to allow you to download additional games from the game's website and play them on your system, but it was never actually implemented. According to the games producer, it was requested by Sony to be removed at the last minute.
Contributed by DeerBoarDude