Twisted Metal Black Help

Here are some cheats for Twisted Metal Black for the Playstation #2:
(you can use these at any time during the game)
The directions are for on the D pad.

For freeze missiles: press up, down, up.
For mines: press right, left, down.
For charge mine: press right, left, down for a second.
For invisibility: press left, left, down, down.
For sheild: press right, right, down, down.
For jump cycle weapons: press L1 and L2 simultaneously.
For fire rear weapon: press right, left, down, and fire.

You can use any of these as the match is about to end and if you have it still on it will stay on forever until you type any of these in again.

Cheats submitted by Abandonship3 (so yell at him if it doesn't work!)