Unlock Accessories
     Prayer  Beads: Beat A Chilled Moon (Stage 16) with a time of 1:10
or better.
     Needle of Fury: Beat A Clouded Moon (Stage 6) in under 1 minute.
     Providence  Mirror: Found behind the red archways at the very end
of  A  Chilled  Moon  (Stage  16).  Go  behind the archways (where the
Crimson King makes his final stand) and drop off the ledge. Look under
the ledge to find the Providence Mirror.
     Sutra of Aggression: Beat Kudara in Floating Tower (Stage 9).

Unlock Magic
     House  of  Soryu  Level 1: Dropped after killing one of the Staff
Ravens in Forbidden Mansion (Stage 2).
     House of Soryu Level 3: Beat Golem's Ravine (Stage 19) in under 2
minutes.
     House  of  Suzaku Level 2: Found in Eternal Night (Stage 17) near
the gate at the top of the cliff at the beginning of the stage.
     House  of Soryu Level 3: Beat Lair of Fire (Stage 22) with a time
of 1:39 or better.
     House  of  Byakko  Level  1:  Found in the well at the end of the
initial pathway in Ancient Captial (Stage 4).
     House  of  Byakko  Level  3: Beat Inner Sanctum (Stage 20) with a
time of 1:39 or better.
     House  of  Genbu  Level 2: Found in one of the brazier's near the
row of columns set into the cliffside in Sea of fire (Stage 15).
     House  of  Genbu  Level 3: Beat Canyon of Death (Stage 23) with a
time of 1:39 or better.

Unlock Weapons
     Training Sword: Perform a 400-hit combo in Sprit Wood (Stage 11).
It's possible, check out the walkthrough to see how.
     Punisher:  Found  at the base of the hill to the right (where you
meet the boss) in A Clouded Moon (Stage 6).
     Sword of Voracity: Kill 60 enemies in Stage 26, Valley of Prayer
     Thunder:  Found  in Stage 22, Lair of Fire, underneath the bridge
between the center island and the large statue.
     Golden  Dragon: Found in the narrow passage near the beginning of
Inner Sanctum (Stage 20).
     Holy Staff: Beat Sea of Fire (Stage 15) with a time of 2:47 or better.
     Dragon Point: Kill 30 enemies in Restless Sea (Stage 7).
     Ogre's Horn: Defeat the Blaze Ogre near the beginning of Darkfire
Cave (Stage 18).
     Staff  of  Duality:  Found in Forest of Wind (Stage 24). Look for
the  small  passageway  inside  the tree stump. On the other side, the
Staff rests above the entrance, on top of the stump.
     Dragon Staff: Finish Palace of Gold (Stage 5) with a time of 3:20
or better.
     Butterfly  Staff:  Destroy  the  plants on the left side near the
beginning  of  The  Green  Cave (Stage 10). One hides a secret hallway
where the Butterfly Staff can be found.
     Black  Swallow:  Found  behind the start point of Canyon of Death
(Stage  23).  Once  the  stage  begins,  turn around and head into the
alcove.  Kill  the  Death  Serpent  waiting  for you to earn the Black
Swallow.
     Jaws  of  Mountain:  Found  in Spirit Wood (Stage 11). Follow the
narrow  path  to  the right of the start point and cross the bridge to
receive your prize.
     Rune  Scimitars:  Perform a 20-hit combo (or greater) in Mountain
Gates (Stage 3).
     Moonlight Sword: Free 100% of all souls in first 28 stages.
     Skylarks: Beat Stage 14 in under 2 minutes.
     Orchid Malevolence: Kill the Hydra in Stage 25.

Unlock 2nd Play
     Beat  the  game  once to unlock the 2nd Play option. You can play
the  game again with all weapons and items carried over from your last
game.  You  also  gain  the  ability to destroy strong object with a B
attack and your stats increase.

Magic Opposites
     Magic  that  opposes  one another do double damage and magic from
the same house does half damage.

Byakko (Chimera) opposes Soryu (Dragon)
Genbu (Butterfly) opposes Suzaku (Phoenix)