There are a total of 50 Red Jewels to find throughout the game, which you can hand in to the mysterious Gem the Jeweler for various upgrades and rewards. See the "Secret Level" cheat for the reward unlocked at 50 Jewels.
|Unlockable||How to unlock|
|Herb||3 Red Jewels|
|Defense Force (Defense +1)||5 Red Jewels|
|Life Force (Max HP +1)||8 Red Jewels|
|Strength Force (Strength +1)||12 Red Jewels|
|Psycho Power (Increased Psycho Dash damage)||20 Red Jewels|
|Dark Power (Increase Dark Friar damage)||30 Red Jewels|
Hold A and Rotate the D-Pad Clockwise (don't push each D-Pad button once, rotate it clockwise not once taking your hand off the D-Pad!). He will attack in all directions!
Get to the Pyramid (which is right after Dao). When you are in it, you will see a dark space portal. Enter it and become the new character. Talk to Gaia. He will give you Aura. Press B to use Aura. You will have to see small stones under the floor.
Kara will say taht she will not eat fish. When you see a fish, jump hit it with your sword. It will come on board. Eat it, talk to Kara, and she'll eat it.
Once you reach the statues inside a little maze, use Freedan and use Dark Friar on the statue. If it did not work step slightly to the side until you manage to attack it with the dark friar. Once the statue is hit it will rush through you and you will pass the statue.
In the alley in Euro City is a church-like location. Enter to find a hidden passage containing a surprise just for you ^_~, a good surprise mind you =P.
In the diamond mine while you are rescuing the laborers, there is a laborer stuck inside a cleft near the first dark space you encounter. Go all the way up to the left of the dark space and you should see the wind blowing your hair. Use Will's Psycho-Dash to open the wall. He will give you 3 red jewels as a reward.
After completing the game wait for the credits to end. Kara should be standing next to Will. Wait slightly longer, and Kara will move closer to Will. Wait even more and you should see will standing in what looks like a school, after a few lines of dialogue all of Will's friends will start to run by ^_~.
Once you obtain all 50 Red Jewels, talk to the Jeweler. Pick the final option to be transported to a secret level containing many diffucult enemies not found anywhere else in the game, and a secret Boss, Soul Blazer awaiting you at the end.