This page contains I-Ninja Unlockables for PC called "Battle Arena" and has been posted or updated on Jan 20, 2010 by kelvin.
- Developer: Argonaut Games
- Publisher: Namco
- Genre: Action Platformer
- Release: Apr 23, 2004
- ESRB: Not Set
To unlock the Battle Arena, get all the grades. You should then get the Master grade. The Battle Arena will now be open in Robot Beach.
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