Battle, by 
I’m not sure where to start with this.
On the one hand, Diamond Mines WAS a fun level, with some caves (presumably the mines) at the very bottom, a few open areas and grassy plains at the top, and some chambers and passages in the middle. Layout was pretty straightforward, and eventage wasn’t too bad.
On the other hand, the coin warp was a pain in the neck to collect coins for. The eyecandy, while all right, could’ve been better.
Also, the music didn’t really fit very well (see my article Here for how I feel music should mesh with a level). I would’ve gone with something maybe a little more natural, sort of outdoorsey?
In any event, Diamond Mines was STILL a good, quality level, and I think it’s worth a download.