Hidden songs:
Play any game disc in an audio CD player to hear two additional songs.

Extra damage:
Press X when using the sword or scythe to attack.

Hint: Excellent armor:
After obtaining all three characters and defeating the first Boss, go into the cave behind and search the skeleton. You will find extremely powerful armor for the main character.

Hint: Dancing Harv-5:
When you go to Eyre for the second time, sleep at the inn. When you wake up, you will see Harv-5 dancing. There will also be some intriguing dialogue.