Cheat codes

[Ninita]

Taken form the guide:

There are 18 collectables hidden in the game, one in each level, find all of them and deposit them into the console in the Trophy Room back at the beginning of the game and you will unlock Cheat Mode.
The cheats will also be available when starting a new game.

To use the cheats, first go into the in-game menu.
Now you need to enter a combination of 5 directions with your keyboard or gamepad.

Here's one cheat code for you, to enable/disable Black and White mode enter:
Left Right Down Right Up

The other 11 combinations you will have to figure out on you own, but we'll give you this hint, all combinations starts with the 'Left' direction.

I tried all possible combinations and here's what I found (I'm probably missing one, though):

ABILITIES
Air Glide - LUUDD
Drop Bash - LUDDD
Glow - LRRUR

ITEMS
Bomb - LUDRR
Magnet - LURUR
Key - LDRDU

MISCELANEOUS
+1 Coin - LDRRR
Invincibility - LDUUD (WARNING: it seems that the invincibility cannot be deactivated)
Black & white mode - LRDRU
HP refill - LRRRR

UNIDENTIFIED
??? - LDUUR
??? - LRDUD