They are scattered around each level. They can vary in difficulties as well like easy, normal, and hard. The easiest way to find them is go to your rail map and check what each mission is. Below the name of the mission it says what kind it is like a sponsor challenge, magic circles, ETC. If you need any other help let me know man. I just completed the entire game like two days ago.
__________________  ^Thanks ThatTorcKid!^ Games I'm waiting for- GoW 2 - Pre ordered
- Left 4 Dead - Pre ordered
- Mortal Kombat VS DC Universe - Pre ordered
- Rock Band 2
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- Guitar Hero: World Tour - Pre ordered
- Halo Wars
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- Dead Space
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amped 3 help 
Linear Mode
