@ Geoj: challenging? yes, maybe, much appreciated? yes indeed !, rewarding??? nooo, definitely not... like the postman mission, you get 35 clintz for it? IMO this is ridiculous ( I think for the effort they take all missions should be at least 10 times more rewarding, especially the ones that give a few tickets for the slot machine...)
It's a little ridiculous but to be honest missions aren't something you should 'focus' on, they're something you should work towards whilst playing this game normally. If all you do is play to win missions then yes the prizes are going to feel unfair because you put more effort into it then they wanted you to.
Secret missions are:-
Xantiax Leak - Remove 250 Life points from your opponents with a Berzerk
Fatal Poison - Do 100 Poison Damage with a Nightmare
Provisions for the Road - Win 150 pillz with 1 character of the Piranas clan
Girl Powa - Gain 200 Life Points with a Pussycats
Green Peas - Gain 100 Heal Life Points with a Roots
Sea Breeze - Win 200 rounds with the Ulu Watu
I wish for the newer players in game, or even any that don't use real life cash, there would be more missions and missions in general have greater rewards. Nowadays, if I go to tourneys, I realise everyone's cards are wayyyy better than mine, and I've been trying to save up for great cards which takes weeks to get if I'm Lucky.