Easy rare cards:
When you unlock the Proving Grounds, you should be able to
defeat each floor with ease. At the end, you get to choose
rare and powerful cards.
Good ending:
Defeat the unknown men and get the Stone of Sealing before
you go to the castle and fight with Sol. Defeat the Body of God
for the second time in the Royal Tower to view the ending.
Hidden items:
Press A in front of all four statues in the cathedral; they point
to a wall. Walk into this wall. It should open up, revealing a
small room containing 2,000 Magic Stones, one Vampire Card, and
one Plague Rat Card.
Temporary invincibility:
Take an independent or helper card and throw it. Keep holding the
card button so that it does not immediately hit the ground.
As long as the card is in the air, you are invincible.
Sites: