The rules aren't completely finished yet, so I'll post what I can for now.
Now, anybody familiar with the WoW TCG will probably see where I got the general idea for this format.
When I came up with this idea I was thinking "Xaldin was a fairly difficult fight in KH2, and they'll never be able to carry over that level of difficulty from the game to make things balanced and fair..." and then I noticed my Raid deck for WoW TCG. Suddenly: IDEAZ!
The idea behind it is:
3 players pit their decks against one 'Boss' player. The 3 player's will be using standard KH TCG decks, with some added effects to their player cards and certain Friend and Magic cards, whereas the 'Boss' player will be using either one deck made extensively of Heartless and another deck made of special "Effect" cards and World cards. Now, to counter-act 3 players all vying to take down the 'Boss', the 'Boss' is going to be hard as nails.
Instead of being an Aggro or WR focussed game, this game is going to focus on JoaT for the 'Party', however, it is possible to play it with Aggro and WR, but not all Aggro or all WR.
The 'Party' will have to World Race to World Count 13 to actually strike blows against the 'Boss'. Since the 'Boss' will probably want to disadvantage them, this is where the Heartless deck comes into play. Every turn the 'Boss' will draw a number of Heartless, and play as many as possible in order to slow down the 'Party'. Each player in the Party will be trying to get to World Count 13 individually, however, if any of the player's is on the same World as one of the Party members, then they can help to clear Heartless from both their World and their ally's.
Once World Count 13 is reached, then that player can proceed to either help out his/her fellow Party members to help them get to the same World Count, by clearing Heartless on their Worlds or playing Worlds in their World Zones to bump up their World Count.
Of course, the Boss will also be a combat monster. And the 'Effect/World' deck will also be disadvantegeous to the Party. By playing World cards on the player's World Zones then the Boss may be able to change the Worlds to his advantage i.e playing more Heartless, getting certain effects. The effect cards are something I'm still working on.
Now, it's probably slightly pre-mature to be asking for opinions, but if you have an opinion on what I've written thusfar then PLEASE tell me. Also, if there's anyone who wants to collaborate on this with me then again; TELL ME.