sorry, im a bit rusty in the new stuff to solda
but, what is advance mode and what does it do?

Players are limited to secondary weapons on game start. A new weapon can be selected every couple of kills
(every 10% of the Kill Limit or 10% 5 x Capture). So for example if the limit is 30, you get a new random weapon every 3 kills,
and lose a weapon every 3 deaths.

quite complicated, but.. you get the hang of it after a while.

thx

It's a nice way of exploring all the weapons, as you're forced to choose the available ones and improve your skill upon them rather than just jump in with your weapon of choice in normal matches ;-)