Cheat mode:
Shoot down 1000 ducks to unlock the "Cheat Menu" button at the lake menu. Click on the button to access the following options after they have been unlocked.

Unlimited ammunition:
Enter the cheat menu. The "Infinite Ammo" option is already available by default.

No ducks missed:
Enter the cheat menu. The "No Missed Ducks" option is already available by default.

Slower ducks:
Shoot down 250 ducks in Evening Lake. The "Slower Speed" option is now unlocked in the cheat menu.

Space Shooter mini-game:
Shoot down 250 ducks in Dark Lake. The "Space Shooter" option is now unlocked in the cheat menu.

Challenge mode:
Get a ranking on Legend. The "Challenge Mode" option is now unlocked in the cheat menu.

Master code:
Note: This code requires v1.01 or higher. Click the "Start" button at the title screen, then enter EXPERTHUNTER as a name. All cheats, a Legend ranking, and all the lakes will be unlocked.