Test Drive 6

In cop chase mode, if you catch all the speeders on all five tracks - Paris, Rome, New York, Hong Kong and London - then it will open "Stop The Bomber" game mode.

$6,000,000: Enter AKJGQ as a name.
All cars: Enter DFGY as a name.
All tracks: Enter ERDRTH as a name.
All quick tracks: Enter CVCVBM as a name.
Shorter tracks: Enter QTFHYF as a name.
All challenges: Enter OPIOP as a name.
Disable checkpoints: Enter FFOEMIT as a name.
Stop The Bomber mode: Enter RFGTR as a name.