I just unlocked Extra in SA,(with eng. patch). But when I tried Extra out it froze during the 1st wave and so I used the task manager to end it. But then when I open it up again, Extra's locked again. I checked the data and it said I cleared once with Marisa A and when I checked practice mode it allowed me to go on stage 6. I remember the patch doing this, but I thought that was only if you 1cced with easy.