How can I do it on the different platforms?
iPhone/iPad
Slide with 2 fingers (right to left) and the same to have back the Enhanced Version.
Xbox 360
Press the Back button on your controller.
PC
Press F1, or press Page Up for Classic Mode and Page Down for Enhanced Version.
PlayStation 3
Press Select button
Mac
Press 0
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2
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On the PC version, press F1, or press Page Up for Classic Mode and Page Down for Enhanced.
On iPhone, slide with two fingers right to left.