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Bonus Arena
In World 1 Arena 1, after you have blown up the atomic door with the "world's smallest atomic device", turn around and go back to the original cave you started the game in. You will find a shimmering pink ball. Step into the ball. You will appear in a new arena. Shoot all the Grunts in this arena. A tornado (useful for killing everything in an arena) and health bites will float down. Pick up these goodies and then step back into the ball. You will arrive back into the original cave and continue onward to Arena 2.
Level Select
At the title screen press Left, Circle, Triangle, Up, Square.
Weapon Codes
Enter these at anytime during gameplay, do not pause. 
Hand grenade: T, O, S, S, L1, Right.
Mortar: Left, L1, T, S, Right, O, Left, Left.
Dummy Decoy: X, L1, Right, O, X, Up, S.
Super Chain Gun: Left, L1, Down, S, T, Up, Down.
Cow Drop: Up, Down, Down, L1, Right.
Homing Sniper Grenade: Left, Up, X, S, L1, L1, Right (or pause the game
        and press Left, Up, X, T, L1, L1, Right).
Bones Airstrike: Down, Up, O, Down, Up, Down, L1.
Most Interesting Bomb: While playing, pause the game and press Down, 
        Right, O, O, Left, Left, Up, S, T.
Sniper Grenade: While playing, pause the game and press Up, S, L1, 
        Left, O, T, S.
Thumper Weapon: While playing, pause the game and press Down, Up, 
        Left, Left, T, Up, Right, Down.
Twister Weapon: While playing, pause the game and press Down, L1, S, 
        T, Right, Up, X.