Since there is no digital "PS2 Classic" version of CNK on the PlayStation Store, you must use original physical discs on specific hardware:
is a kart racing game developed by Vicarious Visions and published by Universal Interactive (2003). It was the follow-up to Crash Team Racing and features:
never received a native PS3 port or a digital release on the PlayStation Store
: Only the 60GB and 20GB "Fat" PS3 models can play the physical PS2 disc of Crash Nitro Kart .