It worked <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
To get the cheat to level up via the level-up jug, follow these steps EXACTLY!
1: Get the key for the jug (kill a nearby friendly wasp)
2: Drag the jug into your inventory
3: Save the game
4: Use the duplication cheat on the key
5: Save the game
6: Use the duplication cheat on the jug
7: Save the game
8: Drop the jugs in seperate places, not together (if there is a 2 above it in your inventory hold down ctrl whilst dragging it)
9: Drop 1 key, just 1
10: Use the key in your inventory in one jug
11: After getting level-up, pick up the other key and use it in the other jug (preferably after you duplicate them again)
12: Make sure you leave with at least 2 jugs and 2 keys in your inventory, or you will likely experience problems and the jug could disappear.
13: Always duplicate the jug before you use this cheat, if you use the last one, this cheat will never work again(unless you re-load the nearest save)
I hope this helps.