Crash: Mind Over Mutant Cheats (PSP)

Skins can be unlocked by beating requirements in the minigames listed below.

Magmadon Skin - Talk to the cub in the village (Take Roller exit with all the Mojo)
/ Defeat the enemies before time is up

Ratcicle Skin - Talk to the character to the right of the purple blocks puzzle /
Survive the Ratcicle minigame

Skeleton Skin - Speak with Uka Uka in the Yuktopus area / Survive the Mt. Grimly
mini-game

Snipe Skin - Near Co-Co battle site, talk to Krunch / Beat the Wumpa minigame 

Spike Skin - Talk to the three-headed dude near the meshed wheel / Beat the
Junkyard minigame

During gameplay, pause the game and hold R while entering these cheats.  Note: they must
be entered quickly; entering them again toggles the cheat off.:

Down, Down, Down, Up - Freeze enemies

Left, Right, Left, Right - Shadow Crash

Up, Down, Down, Up - Enemies drop purple fruit

Up, Right, Down, Left - Enemies drop shoes

Up, Up, Up, Left - Enemies drop boxing gloves

Right, Right, Right, Up - Enemies drop Wumpa Fruit

Left, Left, Left, Down - Warped  Crash