Could create a tower with different rules such as
Can only ride mount or
Can only use bombs or
Can only use arrows or
Can only stay in flag room for a set period of time or
In room where flag is, it is obtained by keeping a series of switches pushed down or
Just how about forget flag rooms and make a dungeon with series of bosses you fight with members of guild. And if you make a new tower add a New town that has CTF, addition to scarf quest, new bug, new hat/ mount shop, railroad access, clothing store , vip room, some weird graal shiii that makes no sense and seems kind of satanic.