Suzuki TT Superbikes - Platform: Playstation 1

Cheat Mode:
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At the main menu, press R1, R2, L1, L2, R1, R2, L1, L2 to display the 
cheat entry option. Then, use the onscreen keyboard to enter one of 
the following codes to activate the cheat function:

All bonuses
Enter WORLD CHAMP as a code to unlock all bonuses.

Auto-pilot
Enter AUTO PILOT as a code. Press R3 during a race to activate it.

Boost in all events
Enter BOOST as a code. Press L3 during a race to activate it.

All bikes
Enter FUNKY MOPEDS as a code to unlock .

All collection book items
Enter GOODIES as a code to unlock all bikes.

All helmets
Enter BONE DOME as a code to unlock all helmets.

All leathers
Enter GRAVEL RASH as a code to unlock all leathers.

Most events and full TT course
Enter SPEEDFREAKS as a code to unlock most events and the full TT course. 
Note: This will not unlock the Mad Sunday events.

All wheels
Enter HOOPS as a code to unlock all wheels.

Mega-boost in all events
Enter ENERGY as a code. Press R3 during a race to activate it.

Mad Sunday events
Enter WINGS as a code to unlock the Mad Sunday events.

Note: These codes are applied to the European version of the game.

Full Nitro
During a Mad Sunday event, hold L2 + R2 + X to smoke the tire. 
Then, release R2 + L2, press Left or Right then press L3 to activate the nitro. 
This will give you full nitro quicker than riding the course.