Go to "Options" then "Enter an Avalanche Code."  Next, type in JAS3IKRR as a code.

Unlock Hard Avalanche Challenge

Go to "Options" then "Enter an Avalanche Code."  Next, type in 2AUNIKFS as a code.

Unlock Expert Avalanche Challenge

Go to "Options" then "Enter an Avalanche Code."  Next, type in EATFIKRM as a code.

Unlock Extreme Avalanche Challenge

Go to "Options" then "Enter an Avalanche Code."  Next, type in 9AVVIKNY as a code.