No, they don't, sorry.
The throne of fire already came out a few months ago, you can probably find it at any bookstore you go to!
You can be any lvl. the only way to get into the sphinx is if you beat the throne of fire and the palace of fire!
You have to get into the throne of fire (payed with crowns) than complete the story line quests in there and you will be able to go to the Krokosphinx
first you have to go to the throne room of fire and finish there and then you will get a quest to go to the krokosphinks but it does cost crowns FYI.
If you go to Rick Riordan's site by simply googling (or binging I guess) Rick Riordan and go to the link that says "Welcome to the Online World of Rick Riordan!" Simply click there. If you go to the Kane Chronicles section you'll find Throne of Fire and if you go to the end of the summary (or whatever it is) on that page it'll say that you can read the first two chapters on some Disney website.
Beat the palace of fire.After you have beaten it it tells you to go to the throne of fire and after you beat the throne of fire you unlock it.OKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKK
Aric Carter goes by Aric C. Carter.
No and it is Shawn Carter not Sean Carter that's how diddy name is spelled
Carter Jahncke goes by Duxbury.
Ali Carter goes by The Captain.
Benny Carter went by The King.
Chet Carter went by Chet.