Of those three, some kind of lava based PvP game sounds most interesting, if that's what it is. If I were still working on minigames, I would look into that one, but the others just don't suit. Skyblock Battle though, that could be good though! Jumping puzzles are something that can be done without being added to Minigame world. Anyway, since its now down to Alpha, he might not even maintain the game system, so your guess is as good as mine to if he is going to add some..