To reveal the full map:
during the game press select to bring up the map, then while holding select press circle five times. Do not pause the game.
(RumorHidden Character:
Supposedly, you can unlock and use Azuma Shiunsai.
Just finish the game with every character getting grandmaster on every level without using other cheats.
We have more cheats and tips for this game here, Tenchu 2: Birth of the Stealth Assassins cheats
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