Shadow Zero mini-game:
Complete the "Jewel hunter" quests (The Lost Princess, The Flame of Hope, Drowned Dreams, The Looking-Glass Tower, The Lucky Clover, Cosmo, Two Pearls, Alexandrite, Flourite, and Tear Drop Crystal). When those events are finished, go to the bar in Domina on Salamander day. You should see a Shadow Zero standing near the counter. Talk to him to play the game. Alter the names of items:
On the menu screen, go into the equip menu. Choose the item of your choice, choose the status of the item, and press X twice on the item. A name creation screen will become visible, and you can enter the name for the item. Monster eggs:
Always look for monster eggs in the boss levels. There is almost always one here ! Also if you can't find a monster egg in a given battle area, then leave and return. Keep doing this until you get a monster egg. When you do get a monster egg, remember the spots where the monster egg usually comes, and place food there. But remember that you can only have a max of 5 pieces of food placed at a time.