How do you unlock challange rooms in batman arkham asylum?

How do you unlock challange rooms in batman arkham asylum?

i thought that it was the riddlers riddles ,but i dont kno . is it the little qeustion marks ? and if so what ones.How do you unlock challange rooms in batman arkham asylum?
Certain Riddler Challenges will unlock the challenge rooms. If you Press the Select Button to view the map, and then scroll over to the section that says "Riddler's Challenge" it will show you everything you have yet to find. If there is a key symbol on a picture, it unlocks something, either a bio,character trophy, or a challenge room.How do you unlock challange rooms in batman arkham asylum?
when ya look at the riddlers challeges page in the menu some of them have keys on them that means they unlock something, challege room-character trophy.

this link is a good guide for finding the specific ones for the different challenge rooms: http://wikicheats.gametrailers.com/index鈥?/a>



but this comes in handy too for the game if your goin for the 100% finish:

http://www.gamesradar.com/f/batman-arkha鈥?/a>How do you unlock challange rooms in batman arkham asylum?
Some of the riddler's riddles will unlock the challenge rooms, however there is no way of determining which ones from just the riddle main screen. Anything that has a little green ? in the corner of the riddle icon unlocks a prize, but that could be a character model, or challenge room.
By finding the answers to the Riddler's questions, trophies or whatever throughout the game. The items with the key graphic are the ones that unlock challenge rooms and character bio's and trophies.