Might And Magic 6: The Mandate of Heaven Codes -

Unlimited experience points:
Complete the quest for the Fire Lord in the Hall of the Fire Lord. Then, repeatedly click on "Quest" to continuously raise your character's experience level. Note: The amount of gold available for training may limit the use of this trick.

Hint: Unlimited money:
Get all the obelisk information, then go to the rock indicated in the desert part, surrounded by many dragons near the Shrine of the Gods. This should raises all your characters stats by 10 permanently. You can click on it, then collect the 50,000 gold and the items. Exit, then click on the rock and you will collect the money again. Repeat this as needed.