Instructions
Start or load a game of Littlest Pet Shop.
Move your character to the "Mailbox." Point the WiiMote at the box and press "A" to check your mail.
Follow the instructions sent to you via the Mailbox. You will receive letters instructing you to complete short tasks, such as walking pets or letting them play with accessories.
Complete eight tasks to unlock a new world. The first world unlocked is the "Garden," then "Winter Wonderland," and finally "Jungle." The Jungle will be available to you after completing 24 tasks, as instructed by the Mailbox.