Pizzatron 3000, switch the red lever to the candy. This gets you bonus coins while you play.
Go here for a free hardhat in the mine.
Go to the Rockhopper Books in the Coffee Shop Book Room for a bracelet.
Go to the Stage and click every single button on the Switchbox 3000 for a Stamp!
Go to the Book Room and click on the book on the right side to go to all the books. Then click on the old looking brown book and scroll to the last page for a Key Pin with a Puffle on it!
