Fast and Free Healing
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During the game, pause it and press
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Upon doing so the game will un-pause on its own and your health will be 100.

Increase All Items by One (unless maximum has been hit)
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At the item select screen hold L2 and then press
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99 Item Carrying Capacity
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At the item selection screen Hold L1 and then press
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Get all the Hidden Items
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At the item select screen hold R1 and then press
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 Make All Levels Playable
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At the level select screen hold R2 and then press
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Upon doing so all 10 levels will be selectable.

Level Layout Select
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Each level has 3 layouts, A, B, and C.
To choose which one you want, at the level select screen hold R1 and then press
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Alternate Ayame Costume
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(Ninja Armor Required)
At the item select screen press
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Upon doing this, the Ninja Armor item will be automatically selected and when you start the game you will see her new costume.

Japanese Dialogue Against Onikage
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On stages 3, 6, 9, and 10 (each which contain a scene with Onikage) you can change the language to Japanese.
At the level select screen hold L1 and then press
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