these ideas are popping in my head like raging-hormone-teenager's zits.
so here I go again.
New buy_weapon option.
this new option will be picked just like any other special weapon/armor would.
What it does is every round, you get a random special weapon or armor.
just like in random special weapon arena, except you have to buy with credits.
I'm thinking 10 credits is a good amount. an average of all weapons plus few more credits for having variety.
somewhere around 8~12 sounds reasonable.