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VARIOUS HINTS
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¯ Hidden fighters:
    Asuka:        Complete "Story Mode" as a character from a Takara game.
    Manjimaru:    Complete "Story Mode" as a character from a Hudson game.
    Solid Snake:  Complete "Story Mode" as a character from a Konami game.
    Megatron:     Complete "Story Mode" with all characters from Takara games
                  (including the bonus character Asuka)
    Bimbokami:    Complete "Story Mode" with all characters from Hudson games
                  (including the bonus character Manjimaru)
    Moa:          Complete "Story Mode" with all characters from Konami games
                  (including the bonus character Solid Snake)

¯ Hidden stages:
  Complete the "Story Mode" with the named character:

    Artificial Sun Stage:       Moai
    Devil Orchid Stage:         Manjimaru
    Floating Continent Stage:   Bimbougami
    Oil Rig Stage:              Solid Snake
    Tree House Stage:           Megatron