1. Get a ranking on Legend.
2. Go into the Cheat Menu.
3. Click on the button that says ''Challenge Mode: OFF''. The button will change to ''Challenge Mode: ON''. You can now play the Challenge Mode. You have only one chance to shoot as many ducks as you can, and no other cheats (other than the Space Shooter) are able to be turned on.
Achieve the following goals to unlock these bonuses.