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Playstation - Formula 1 '99 cheats

Race at night in a quick race at Monaco:
At Grand Prix mode high score screen, enter the following cheat code 
as a name: "NIGHTS"

Unlock Safety mode:
At Grand Prix mode high score screen, enter the following cheat code 
as a name: "SAFETY"

Unlock Ring mode:
At Grand Prix mode high score screen, enter the following cheat code 
as a name: "RINGS"