Basically, an unranked mod where you can select a part of the beatmap and start playing from there, so you can practise that part (some hard jumps, maybe?) without having to go to the entire beatmap again and without having to edit it. This would be useful for marathon beatmaps or for people that are too lazy to edit the entire beatmap 
. I know there's an option called "Test" in the editor but it only works for Standard.
. I know there's an option called "Test" in the editor but it only works for Standard.