I know that this option had been discussed back in the time of CF2,
but I again want to ask for more different and unique gamemodes:
-the solo gamemode (ranked),
-the arena and
-a gamemode with teams (as in CF2)
there should be some more content, like
-single player challanges (dealing with several static and moving obstacles),
-something like an infinite runner,
-or some kind of bosses you have to win against to get into the next rank (for example from silver to gold and so on).
I know that this is much for a new game that is in development, but I just wanted to share my ideas;
you may also implement some of this ideas later.
My point is to create CF4 as a NEW game, not only a copy of CF2 & CF3, because many players expect something new and challenging. CF4 must contain really new things, otherwise (and that may sound a bit hard) no one will really play it, because old progress is lost and they dont see any reason to start again from the beginning.
If you have other ideas on new gamemodes/singleplayer modes feel free to answer!!
by the way: im from Germany so my English might be the worst sorry