The game places Parappa's neightborhood at the same time of day indicated by the PlayStation2's time setting. For example, if you set the Playstation2's time to 11:30 a.m., it will be bright and sunny in the game. If it is 7:00 p.m., it would be sunset. If you set the time to 10:30 p.m. it will be dark outside.
Game Shark Codes
Master Code (Must Be On) 0E3C7DF2 1645EBB30C075FD3 F891B6FF
Rap Cool 2C0FC1EB F8FCFEFE
Rap Good 2C0FC1EB F8FCFEF1
Score is 9999 2C0FC107 F8FC270F