Ending unlockables
     Finish  the  game under certain conditions to unlock these items.
They will be available on the Story Select menu.

Unlockable:              How to Unlock:

Sketchbook               Finish Helen's story

Helen's Video Room       Finish Helen's story with a least a C rating 
                         on all missions

Audio Room               Finish Will's story

Will's Video Room        Finish Will's story with a least a C rating 
                         on all missions