Free Play mode - Finish the game.|
When you're at the final stage, Karasuma Keep, you must knock the Odama through the main gates. This will take you to a secret stage which looks like modern-day Kyoto! And of course, there's the Nintendo of Japan Headquarters. A Heavenly Odama will come down so that you can knock around Nintendo employees and use them in the final battle. To exit, let the Odama roll into the gutter.