Sega Rally 2 cheats and cheat codes for Dreamcast

Go to the "Press Start Button" screen, then press the 
following button combinations:

All regular tracks and secret track available:
Press Up, Up, Down, A(2), R, B(2), Down. 

(Japanese version)
Press Up, Left, Down, Right, B, A, B, Right, Down 

Unlock all cars (Japanese version)
Press Up, Down, Up, B, A, Left, B(2), Down. 

Change the frame rate to 50 frame/sec:
Press Up, A, Down, Down, Left, Right, B(2), Down 

Change the frame rate to 30 frame/sec:
Press Up, A, Down, Down, Left, Right, B(2), Up


Unlock hidden rally track:
Win 1st place in every year under "10 Year Championship" mode.

Unlockable bonus cars:
Play in "10 Year Championship" mode and win 1st place in every year 
to unlock new cars.

Year - Car
1 - Subaru Impreza 555
2 - Mitsubishi Lancer EVO 4
3 - Toyota Celica GT-Four ST-185
4 - Mitsubishi Lancer EVO 3
5 - Peugeot 106 Maxi
6 - Lancia Delta Integrale
7 - Fiat 131 Abarth
8 - Peugeot 205 Turbo
9 - Renault Alpine A110
10 - LANCIA 037 Rally