SCP Containment Breach was terrifyingly scary. You never knew when SCP-173 was going to show up or where, but not only do you have 173 to deal with, you have 106; an inter dimension traveling "Old Man" who will take you into his dimension if he catches you.
Overall this game scared the crap out of me. At one point 173 had me pinned to a wall after I had opened a door and blinked. Yeah, not fun.
Rating: 8/10
SCP-106's file: http://www.scp-wiki.net/scp-106
SCP-173's file: http://www.scp-wiki.net/scp-173
