King of the hill. Multiple levels of bases. Four bases on bottom level, three on 2nd, two on 3rd, and one at the top (king). Two teams. One team must work way UP the mountain/floating islands while the other team defends it (may spawn at any of the team's bases).
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There are many ways to handle the transition of base possession. One way would be to have an objective, such as a flag, that you must bring to the base to claim it. The attacking team could have a specific # of flags to work with, OR begin with 1 or 2 and be required to gain the additional flags at the lower level bases they capture (as they go up).
When I say bring to the base... this could be a goal (ala TR2), a stand, an area you must hold it for a certain # of time, I don't know. Think about it.
Another way to do it is to simply require a point of control (POC) similar to the Nexon's Shattered Galaxy (
www.shatteredgalaxy.com). Take over the base in a DM-style fashion and you gain ownership. However that would turn the gametype into a flashy DM which isn't all that fun IMO.
Another would be to actually have a mini version of CTF. Capture the flag, take over the base. However it doesn't seem very logical in that you're running your team away from the base in order to capture it?
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Only the team defending the top gains points. The points accumulate over the whole round. Starting sides switch at game start/halftime. Sport-oriented gametype.