This is how to achieve all the endings in SCP Containment Breach
-Gate A Ending 1
You will achieve this ending by failing to recontain SCP-106 (The Old Man) or either refusing to. You need SCP-106 for a distraction.
-Gate A Ending 2
You will achieve this ending if you successfully contain SCP-106. I guess we don't need a distraction anymore!
-Gate B Ending 1
You will achieve this ending by listening to 079, once you re-enable the door controls, SCP-079 (The Old A.I) will announce "The Doors to Gate B are now open", you can either go to Gate A or Gate B.
-Gate B Ending 2
You will achieve this ending by manually disabling the Warheads. Huh, maybe you should have kept them on, something big is there.
Follow my Twitter! - https://twitter.com/T3eFall3