About 20 or so of the songs feature "Challenge" steps in addition to the normal charts (Beginner/Light/Standard/Expert), and there are about 6 that feature "Challenge" steps ONLY ( ...
Japanese DDR EXTREME by far. Other local PS2 versions you'll probably like include SuperNOVA 1-2 and DDRMAX 2. SuperNOVA would probably be best, given your regard for rock music; though MAX 2 and Supe ...