|The purpose with this ladder is that you self can decide with your opponent what mode and teamsize etc that you wanna play. We added this in the rule for this vanilla ladder. http://clanbase.ggl.com/rules.php?lid=13056#chap_2|
3. Optional rules
Gametype: You can pick the gametype of the match you want to play with your opponent.
Custom rules: If you wish to play by your own rules, you may specify them in the challenge.
So basically its up to you to decide what gametype you want to play with your opponent before the match.