I collected 170.000 Exp. but my Chars stay on Level 1. Is there any soltion ti fix this?
Stebbe

Did you train?

I haven’t played World of Xeen, but I assume it works like the other Might and Magic games where you need to train to level your character.

RTFM.

Come on, we can be nice to new players!

In the Might and Magic series, characters do not automatically level up as they do in many other RPGs. Once you have enough XP, you have to visit a training ground in one of the cities and pay for training to advance your team's levels. Later on this will be your main use for money, so don't spend too frivolously on other things!

There's a training ground in most (if not all) friendly towns.

Each training ground has a level cap, beyond which characters cannot train. Later training grounds have higher level caps, so as long as you progress through the game, the cap should not be a substantial burden. Also, as Waltorious noted, training ultimately becomes very expensive. If you want to push your level as high as possible (this is not needed), you will need a very rich party to pay for the training expenses.

Well, he had already got the answer, so...
Anyway RTFM is always a good idea.

Specifically, on Clouds alone (no travel to the Dark Side), the highest you can train to is level 20, and you won't be able to go past 15 until rather later.

On the Darkside, you can eventually train to level 200 (but will run out of money well before then), but it won't be until late in the game that you can go past level 50. The amount of money to get up to level 200 is significantly higher than the amount of money you can find in the game unless you abuse the bank by having a throwaway party work for decades (to accrue interest), then replace those characters with newly created young ones.

There actually is a serious issue with money in the late game; the game is very generous with XP, so you'll have enough to gain dozens of levels, but is extremely stingy with money, resulting in you not being able to afford all those levels you qualify for. It's rather annoying when the game keeps giving you millions of experience, but you can't use it because the game hasn't given you any money for a while, and even worse when a late-game dungeon requires you to either spend exorbitant amounts of money or be forced to take unreasonable amounts of damage. In fact, I consider this issue to be a rather significant design flaw in the game.

I also note that the XP needed per level stops increasing around level 13 or so, but the amount of gold needed per level continues to increase quadratically.

By the way, be aware that training takes quite a bit of in-game time; however, the amount of time it takes is independent of the number of levels you gain on a single trip to the training hall. Therefore, I recommend saving up enough XP to gain a bunch of levels before you go and train your characters all their levels at once.

As an alternative to abusing the banking interest, would it be viable to abuse the Gemstone mountains? Harvest all the rubies/emeralds/etc. there, get the gemsmiths to make items for you, sell those items, and use a portion of the money to pay to recharge the mountains. Repeat as necessary. It's tedious, but probably more money efficient in terms of in-game time.

The game is too easy. Why resort to cheating and tedium when you can beat the game with lower level characters?

It's certainly not more efficient in real-time, however.

To put it into perspective, some years ago I saw a speedrun of Isles of Terra (where the same banking trick exists, but there's also a gold to experience fountain accessible early) in which the player actually did level up a few characters to level 200. (The ending level was a bit lower because Mr. Wizard, which the run heavily used, costs a level to use in MM3.) * Sometimes, it's fun to just get powerful for the sake of being powerful, especially if one wants to do things like kill the Mega Dragon quickly or with one character.
* Not everyone agress that the game is too easy.
* It's still annoying to be given tons of XP and not being able to actually use it; this causes it to feel like endgame quests give no reward in terms of character growth.
* I am not aware of any cheats being mentioned in this thread. (Your post is the only one to even refer to cheating in any way, other than this part of this response to it.)

Ahhh..thx Dudes! Forgot about that. Playes m&m years Ago.

Except that I'm not a dude, so please don't call me one.

Why do you assume he was thanking you? He was thanking the dudes only, which he clearly wrote.
Enjoy the game!

What a snowflake.