So my idea is that there is an option to take any song that has an even numbered key count and have 2 players be able to play half of the keys so 8k for example will run with 2 players playing 4k, this mode doesn't really need to be ranked however it would be interesting having charts specifically for this to compare ranks with other players of this idea, it may be an option too expand further on this in multiplayer such as a 10k song having 1 person on each key and being custimizable so that the players have to set their keys beforehand and it is possible to have players playing 7/3k etc