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Basically, the idea is to beat World of Xeen with the following restriction:
You aren't allowed to train your characters at training halls.

You can still use events that boost level, whether temporary or permanent. This gives you +3 levels from Clouds, and (I believe) +15 total from Darkside (counting that one Death dungeon), and there are temporary boosts to use, like the one on the Dragon Clouds.

Has anyone here done this?

A good definition of beating the game (for 100%) is as follows:
1. Trigger all three endings (without using the special mirror codes to do so)
2. Defeat the Mega Dragon
3. Get the award from the Dungeon of Death B4F.

It also makes sense to add another rule: No using the mirrors to warp to "I Lost It" or "Lord Xeen".