Odama - Gamecube
Free Play mode - Finish the game.
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Kyoto Stage
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.