To get the ultimate motorcycle in the game go to the 'Title' screen and while holding Up, Square and Circle press 'Start' and if you've entered the code correctly the Wild Thing motorcycle should become available.

Enter the following codes to unlock the corresponding levels. The second number in the password sometimes changes to a 9 for some remotes and bonuses.

Unlock Goth 2:
Enter the code 171058

Unlock Goth 3:
Enter the code 950745

Unlock Goth 4:
Enter the code 472149

Unlock Anciena 1:
Enter the code 672451

Unlock Anciena 2:
Enter the code 272578

Unlock Anciena 3:
Enter the code 652074

Unlock Anciena 4:
Enter the code 265648

Unlock Anciena 5:
Enter the code 462893

Unlock Anciena 6:
Enter the code 583172

Unlock Anciena 7:
Enter the code 743690

Unlock Ultraworld 1:
Enter the code 743690

Unlock Ultraworld 2:
Enter the code 103928

Unlock Ultraworld 3:
Enter the code 144895

Unlock Ultraworld 4:
Enter the code 775092

Unlock Ultraworld 5:
Enter the code 481376

Wing Commander - Invincibility and Stage Select:
At the 'Play' Select screen press X, O, X, Square, X, Square, Left Bumper, O, Right Bumper, 0, Start.

Desert Strike - Get 10 Lives instead of 3:
At the Desert Strike Main menu press square to access the password screen and enter 'BQQQAEZ' without the quotes.

Jungle Strike - Extra Lives
At the Main menu press 'Square' to access the 'Password' screen then enter the following codes without The quotes to start at the corresponding level with 23 lives.

Start with 23 lives in Training Ground:
Enter '9NHDXMGCZCG'.

Start with 23 lives in Washington D.C
Enter 'BXYTNMGCYDB'.

Start with 23 lives in Mountains:
Enter '7LSPFBVWTWP'.

Start with 23 lives in Night Strike:
Enter 'X4MFB4MHPH4'.

Start with 23 lives in Puloso City:
Enter 'V6HGY39XVXL'.

Start with 23 lives in Return Home:
Enter 'N4MK9N6MHM7'.

Start with 23 lives in River Raid:
Enter 'TGB76MGCZCC'.