you have to get 3 MO disks to free chris from the jail cell in the lab at the end. no worries though, if you wanna skip that bit you can and don;t have to bother with the MO disk section, the first one you get is in the mansion right..sorry bad memory, but if so , leave it for now, you wont need it till the labs, or i think i put that wrong..one disk, but 3 disk readers...told you i had bad memory