Make Darkrai Upside Down (Pokemon Diamond)

If you have an action replay ds get to darkrai and put on run anywhere get right on him a run west until you are in finish darkness then go back and darkrai will be upside down its funny how you battle him too.

Golden Shovel (Animal Crossing: Wild World)

Buy 2 ordinary shovels at Nook's store. Bury 1 shovel for 24 hours. It will become a golden shovel the next day.

Larger Stamp (Brain Age: Train Your Brain in Minutes a Day)

Successfully finish three brain challenges in a day and the stamp used to keep track of your progress will get larger.

Easter Egg: Doctor (Brain Age: Train Your Brain in Minutes a Day)

Say "doctor" into the mic at the title screen and Ryuta Kawashima will laugh or scowl.