hi
you are thinking bad about tile.
Not all tile work in the same way, if you place mountain at 30 and grass all around at 0, you have this in worlforge:
------------------------------
| || || |
| 0 || 0 || 0 |
| || || |
------------------------------
| || || |
| 0 || 30 || 0 |
| || || |
------------------------------
| || || |
| 0 || 0 || 0 |
| || || |
------------------------------
but in game you see this
------------------------------
| || || |
| 30 || 30 || 0 |
| || || |
------------------------------
| || || |
| 30 || 30 || 0 |
| || || |
------------------------------
| || || |
| 0 || 0 || 0 |
| || || |
------------------------------
more or less (hard to explain in this way).
where you can't see with your player (north, east, n-e) tile doesn't climb as where you can see them.
To avoid your problem, make two tile of mountain at the same high of the grass, your player climb on the grass-mountain tile
hem, if you speak italian call me (doesn't know if this is useful)
zamfrancescobon@libero.it
bye