Really love the game, but one thing greatly annoys me; the fact that there's no level restriction or something similar for PvP Duel. I've so far tried it around 5 times, paid the 5000 gold and 25 energy and ended up against 200 - 300 lvl opponents when I'm myself around 50 - 60 lvl.
It's just... not fair. Would love to have a bit of balance for that one. =) Cheers!