Worms Blast Cheats

Go to the start screen and HOLD L2 and press Up,
Up, Down, Down, Down, Down, Down, Down, Up, Up, Up.  

At the start screen, hold L2 and press Up(2), Down(6), Up(3). If you entered the code correctly, a volleyball will go from left to right, and splash on the sea. All of the bonus tournament modes will now be unlocked. Alternately, play the game in puzzle mode. As certain levels are completed (for example, Alien Attack), new modes in tournament mode will become unlocked.

At start screen hold L1 and press up(4),down(3),up(5) and it should now be in special mode.
later...

Rocky,Superfrog,and Fletcher
Go to title screen and hold down L1 and press up four times press down three times and then press up five times

Go to the start screen and HOLD L1 and press Up, Up, Up, Up, Down, Down, Down, Up, Up, Up, Up, Up.