A Trick for Golden Pig
I found a little trick with Golden Pig, that you can abuse as many times as you want (I think). The only thing you have to do, is:
1. Find a Golden Pig
2. Go on the fight and immediately quit it.
3. The Golden Pig will dissapear on that level, but will shortly after appear on the other level.
4. Repeat until you will find a Golden Pig on three-wave level!