Barnyard

During gameplay hold C + Z on the Nunchuk, then use the Directional Pad on the Wii Remote to enter these codes

After you buy the Pool Table from the Gopher shop, you can purchase other things the next night. Enable the "9,999 Gopher Bucks" code and buy everything in all categories except for Personal Items. If you run out of money, leave the shop and enable the code again. When you have bought everything, go back to the Night Barn and keep talking to Root. He will give you Milkweed or a Gold Rush Token every time you talk to him. Do this until you cannot talk to him anymore.

You have to race the Jersey Cows in the Farmer's truck a few times, and it can get challenging at times. However, you can get them stuck, though it may require a few attempts. When the race starts, try pushing them behind some trees or a billboard. If done correctly, they will not be able to escape and you can complete the race without seeing them on the map. You still have to worry about the cops, but the Jersey Cows will not be an issue.

Complete the indicated task to unlock the corresponding key.

Sharp Squiter (Barnyard): Barnyard Key

Nine Holes Golf: Old Mill Key

Chasing Chicks vs. Otis: Walnut Woods Key

All 18 Golf: Grizzly Gulch Key

Defeat all Coyotes and Dag: Junkyard Key

While on the Main Menu screen hold C + Z on the Nunchuk and enter these codes with the Wii Remote