Complete the indicated task to unlock the corresponding costumes.
Momiji’s third costume: Complete 25 Ninja Trials with Momiji.
Momiji’s fourth costume: Complete 50 Ninja Trials total with Momiji.
Ryu and Ayane’s third costumes: Collect all 50 Scarabs.
Ryu and Ayane’s fourth costumes: Collect all 10 Crystal Skulls.
Legend Of Zelda reference:
Near the first save point in level 1, go to the gate to the left of the
red bus, The Triforce crest from the Legend Of Zelda series is engraved
on the gate.