Play as Original Kaede
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At the character selection screen, highlight Kaede,
then quickly press X(9), B, X. Kaede will speak to
confirm correct code entry. Press A or Y to play as
the original version of Kaede.

Change Backgrounds :
When seclecting a stage, hold START and press A.

In Team Battle Mode, when selecting a stage, hold
down START button until time runs out. If you have
used the above code, you will need to restart
(START+A+B+X+Y), before this code will work.

All Weapons, Infinite Ammo, Medipacks :

Face Lara exactly north, then enter the inventory.
Highlight Small Medipack and press L, Up, X, Up, R, Y.

Flying Lomax:
After you have used the Level Select code Lomax
can fly! Press L1 + Square to take off or land.