CheatCodes.com has all the official Quest 64 N64 cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday May 22, 2013 for Quest 64 are shown below.
Learn the spell Heal. Now allow enemies to hit you until you have very low HP, around 5, now heal your HP to Max and repeat the process. By doing this, you can easily get your HP well over 400.
Before facing Bosses such as Guilty, Begis, or Mammon, collect as many Dragon potions as possible. During the battle with the Boss, use the Magic Barrier spell under Earth magic. Brian will be protected against magic attacks, allowing him to attack the Boss without harm. Use the Dragon potions to restore MP to cast the spell again when it wears off.
When facing Zelse in the battle for the Wind Jade, Brian can avoid his second attack by standing six or seven steps away from him. When in this position, Brian will be able to easily outrun his attack.
Run towards any monster that uses Earth-based magic while they are attacking. They always miss if Brian is close enough to the monster. Since their stone attacks are more powerful then their physical attacks, this strategy will also conserve hit points.
There is little time to dodge an enemy spell in battle. Hold the Analog-stick over while the enemy is casting a spell. By the time the spell arrives, your character should be out of the way. Note: Practice is required with this trick, since it does not automatically work all the time.
After you leave the castle, turn left and go to the stable with the horse. There is an element stone in the hay pile.
When looking for Elements on your journey, look for "bubbles" shooting out of the ground. They resemble smoke shooting out of the ground from a distance. When this location is approached, a question mark will appear. Tap A, and the Element selection menu will appear. Then, just choose the type of Element you wish to build.
Get within striking distance of the staff during combat. Choose any spell, then press A. You will now hit the enemy with your staff and the elements in a single turn.
If you need lots of health in battle, stock up on waterspells right away! Once you have enough, you will learn a spell that gives you full HP.
Go to a hotel and say you will stay the night. Then, go to the save screen and press B to escape. Now you will have full health.
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