Unlockable Weapons
On the Pause Screen enter the following codes to unlock the corresponding sword

Unlock Baby Toy of Death:
Left, Left, Right, Right, X, Y, Y, X, Up, Down

Unlock Chainsaw:
Up, Up, Down, Down, Left, Right, Left, Right, X, Y, X, Y

Unlock Swordfish Weapon:
Up, Down, Up, Down, Left, Right, Left, Right, X, Y, X, Y

Unlock Telephone of Sorrow:
When you have completed the game once on Normal setting enter Right, Left, Right, Left, Down, Down, Up, Up, X, Y, X, X, Y, Y