Press Pause, Option, 6, 1 + 3, then release those buttons. Then, press B, A, 9, A, 9, A, *, Option, 6, #, *, *, Option, 2, Option. The Predator will laugh to confirm correct code entry. In addition to the "Hold that Fuji!" codes, the following codes may also be activated.

Level select
Press Option + A to jump to the next level or Option + B to play the previous level.

God mode
Press Option + 5 for invincibility and full weapons.

Shotgun (as Marine)
Press Option + 1.

M14-A Pulse Rifle (as Marine)
Press Option + 2.

Flame Thrower (as Marine)
Press Option + 3.

Smart Gun (as Marine)
Press Option + 4.

Refill Ammo (as Marine)
Press Option + 1 + 2 + 3 + 4.

Motion Tracker (as Marine)
Press Option + 8.

Raise Security Level (as Marine)
Press Option + 6.

Lower Security Level (as Marine)
Press Option + 9.

Combi Stick (as Predator)
Press Option + 1.

Shoulder Cannon (as Predator)
Press Option + 2.

Smart Disc (as Predator)
Press Option + 3.

Wrist Blade (as Predator)
Press Option + 4.

Tail Attack (as Alien)
Press Option + 1.

Claw Attack (as Alien)
Press Option + 2.

Extending Mouth (as Alien)
Press Option + 3.