1. Plsy the game DJ3K. Make your penguin dance. Then, open a new internet page and do whatever the hell you want. Just make sure to keep checking in on your game and move the mouse so you dont become idle. If you keep it going you can get a lot of coins!

2. Go to the following web page to get book codes. These got me fricking rich! I started with 2000+ coins and unlocked every book. I now have 12000+ coins!!!
link

(note:this page has good cheats)

i will post more l8r