Unlock All Chapters:
At the Chapter Select - Right, Left, Up, Up, Left, Right

Codes:
Pause the game and enter the code:

Up, Right, Down, Left, Left, Right - Skip to the Next Chapter

SELECT, Right, A, Left, Left, Right - Restore Health

Left, A, Left, SELECT, Down, Down - 5 of Each Consumable Added to Inventory

A, L, SELECT, A, Right, Up - Toggle Ice Mode (all terrain acts like ice)

Right, Left, Left, Down, Up, SELECT - Toggle Cold System (turn on/off body temp decrement)

Right, L, Down, A, Left, SELECT - Toggle Invincibility

A, L, SELECT, R, Right, Right - Toggle Snow Effect (off/light/heavy snow)

Up, Down, SELECT, SELECT, Down, Up - Increases Players’ Attack Ability

A, SELECT, Left, Down, Right, Up - Toggle the Armor Costume (only available in Winter maps)

Unlock new difficulty setting:
To unlock a new difficulty setting:

Epic difficulty setting - Collect all of Mr. Tumnus's items

Unlock level select:
To select the levels you have to beat the game once and you will gain level select.