Yeah I managed to get all the huge materias; I liked the Fort Condor game and found that one easy, I stopped the train with about 2 minutes left, and completed the sub game in under 10 seconds (the red one starts right in front of you, could they make it any easier?). However in my first playthrough I couldn’t get the one from the rocket; Cid’s clues just ended up confusing me… but I got it quite quickly second time. 🙂
Get Closer – The game will tell you that the materia emitted a certain type of glow, based on what type of materia it is. If you meet the requirements for a Master materia, the game will ask you if you want to perform a Materia blend. Tell it yes and you’ll get the Master materia. If you get closer to the Huge Support materia, you should be able to get Bahamut ZERO if you have both Bahmaut and Neo Bahamut. I don’t think either have to be mastered (although I’m not sure) and you won’t lose them either.
Stay Where You Are – Or something like that. This basically cancels the interactiion with the Huge Materia.
Go Back Down – This will take you back down using the elevator.