Successfully complete the game to unlock Merry.

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Circle, Circle, Down, Down

Pause the game, then hold L1 + L2 + R1 + R2 and press Triangle, Circle, Square, Down. If
you entered the code correctly, you will hear a sound. Note: The game must be
completed first before this code can be enabled.

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Down, Down, Square, Triangle

Pause the game, then hold L1 + L2 + R1 + R2 and press Circle(2), Triangle(2). If you
entered the code correctly, you will hear a sound.

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Circle, Down, Down, Down

Pause the game, then hold L1 + L2 + R1 + R2 and press Square(2), Circle(2). If you entered
the code correctly, you will hear a sound. Note: The game must be completed first
before this code can be enabled.

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Up, Down, Triangle, Triangle

Pause the game, then hold L1 + L2 + R1 + R2 and press Square, Circle, Square, Down. If you
entered the code correctly, you will hear a sound. Note: The game must be completed
first before this code can be enabled.

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press X, Circle, Triangle, Square

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Down, X, Down, Up

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Circle, X, Circle, Triangle

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Square, Up, Up, Circle

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Triangle, Triangle, X, Up

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Square, X, Circle, Down

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Down, Down, Square, Square

After Pausing the game HOLD L1 + L2 + R1 + R2 and 
press Triangle, X, Square, Square