Dungeon Interface

here is my suggestion I stick to the slider as mentioned I also added buttons for in / decreasing the values for the fine tuning.

Interface:

I hope you like it or at least it gives you some fresh ideas...   ..  . apsyll
Ps: what font do you use for the game?

Nice design. However, I'm not sure how to customize a slider like that. Sliders are still browser-dependent much. There's also task-related difficulty to take into consideration, but that could be done via an extra icon like the lock icon.

Btw, I really like the thumbnail!
I use MiniSet2 font.