Donkey Kong Country Returns (Wii)
On the game select screen, choose a file that has fewer than 4 balloons, and Cranky will increase your lives total to 4.
Collect all the K-O-N-G letters in each stage of a world to unlock that world's temple stage.
Beat the boss in World 8 to unlock the ninth world: Golden Temple.
To unlock Mirror Mode, beat the Golden Temple. In Mirror Mode, the levels are mirrored, you only have one heart, and you can't use Diddy or any items.