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.